patch 9.2.0318: cannot configure opacity for popup menu

Commit: 
https://github.com/vim/vim/commit/317351c745caafe1890f5ec0de51bc6aa79fd17a
Author: Yasuhiro Matsumoto <[email protected]>
Date:   Tue Apr 7 19:51:20 2026 +0000

    patch 9.2.0318: cannot configure opacity for popup menu
    
    Problem:  cannot configure opacity for popup menu
    Solution: Add the 'pumopt' option, consolidate existing pum options into
              the pumopt option (Yasuhiro Matsumoto)
    
    closes: #19931
    
    Signed-off-by: Yasuhiro Matsumoto <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 064d66c9d..ffe463e44 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*  For Vim version 9.2.  Last change: 2026 Apr 06
+*options.txt*  For Vim version 9.2.  Last change: 2026 Apr 07
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -6886,6 +6886,7 @@ A jump table for the options with a short description can 
be found at |Q_op|.
                        global
        Defines a border and optional decorations for the popup menu in
        completion.  The value is a comma-separated list of keywords.
+       See |'pumopt'| for a consolidated alternative.
 
        Border styles (at most one):
        "single"        use thin box-drawing characters
@@ -6921,6 +6922,7 @@ A jump table for the options with a short description can 
be found at |Q_op|.
        Determines the maximum number of items to show in the popup menu for
        Insert mode completion.  When zero as much space as available is used.
        |ins-completion-menu|.
+       See |'pumopt'| for a consolidated alternative.
 
                                                *'pummaxwidth'* *'pmw'*
 'pummaxwidth' 'pmw'    number  (default 0)
@@ -6932,12 +6934,67 @@ A jump table for the options with a short description 
can be found at |Q_op|.
 
        This option takes precedence over 'pumwidth'.
        |ins-completion-menu|.
+       See |'pumopt'| for a consolidated alternative.
+
+                                               *'pumopt'*
+'pumopt'               string  (default "")
+                       global
+       Configures the popup menu used for Insert mode completion.
+       The value is a comma-separated list of key:value pairs and flags.
+
+       Keys with values:
+         border:{style}        set a border style (at most one):
+                               "single"  thin box-drawing characters
+                               "double"  double-line box-drawing characters
+                               "round"   rounded corners
+                               "ascii"   ASCII characters (-, |, +)
+                               "custom:X;X;X;X;X;X;X;X"
+                                         eight characters separated by
+                                         semicolons, in the order: top, right,
+                                         bottom, left, topleft, topright,
+                                         botright, botleft
+         height:{n}            maximum number of items to show (default 0,
+                               meaning as much space as available)
+         width:{n}             minimum width (default 15)
+         maxwidth:{n}          maximum width (default 0, meaning no limit).
+                               This takes precedence over width.
+                               Truncated text is indicated by "trunc" value
+                               of 'fillchars' option.
+         opacity:{n}           opacity percentage 0-100 (default 100).
+                               When less than 100, background content shows
+                               through the popup menu.
+
+       Flags (no value):
+         margin                adds one-cell spacing inside the left and
+                               right border.  Requires a border style.
+         shadow                draws a shadow at the right and bottom edges.
+
+       Border styles using box-drawing characters ("single", "double",
+       "round") are only available when 'encoding' is "utf-8" and
+       'ambiwidth' is "single".
+
+       Highlight groups:
+       |hl-PmenuBorder|        used for the border characters
+       |hl-PmenuShadow|        used for the shadow
+
+       Note: When 'pumopt' is set, all values are reset to their defaults
+       first, then the specified keys are applied.  Unspecified keys get
+       their default values.
+
+       Examples: >
+               :set pumopt=border:single
+               :set pumopt=border:double,margin,shadow
+               :set pumopt=height:10,width:20,opacity:80
+               :set pumopt=border:custom:─;│;─;│;┌;┐;┘;└,shadow
+<
+       See also: |ins-completion-menu|.
 
                                                *'pumwidth'* *'pw'*
 'pumwidth' 'pw'                number  (default 15)
                        global
        Determines the minimum width to use for the popup menu for Insert mode
        completion.  |ins-completion-menu|.
+       See |'pumopt'| for a consolidated alternative.
 
                                                *'pythondll'*
 'pythondll'            string  (default depends on the build)
diff --git a/runtime/doc/quickref.txt b/runtime/doc/quickref.txt
index fd2775764..770983780 100644
--- a/runtime/doc/quickref.txt
+++ b/runtime/doc/quickref.txt
@@ -1,4 +1,4 @@
-*quickref.txt* For Vim version 9.2.  Last change: 2026 Mar 04
+*quickref.txt* For Vim version 9.2.  Last change: 2026 Apr 07
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -865,6 +865,7 @@ Short explanation of each option:           *option-list*
 'printoptions'   'popt'    controls the format of :hardcopy output
 'prompt'         'prompt'  enable prompt in Ex mode
 'pumheight'      'ph'      maximum height of the popup menu
+'pumopt'         'pumopt'  additional options for the popup menu
 'pumwidth'       'pw'      minimum width of the popup menu
 'pythondll'                name of the Python 2 dynamic library
 'pythonhome'               name of the Python 2 home directory
diff --git a/runtime/doc/tags b/runtime/doc/tags
index cb5692567..3da46d2fd 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -891,6 +891,7 @@ $quote      eval.txt        /*$quote*
 'pumborder'    options.txt     /*'pumborder'*
 'pumheight'    options.txt     /*'pumheight'*
 'pummaxwidth'  options.txt     /*'pummaxwidth'*
+'pumopt'       options.txt     /*'pumopt'*
 'pumwidth'     options.txt     /*'pumwidth'*
 'pvh'  options.txt     /*'pvh'*
 'pvp'  options.txt     /*'pvp'*
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index 8045698a3..31d467e0a 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -1,4 +1,4 @@
-*version9.txt* For Vim version 9.2.  Last change: 2026 Mar 25
+*version9.txt* For Vim version 9.2.  Last change: 2026 Apr 07
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -52641,6 +52641,7 @@ Autocommands: ~
 
 Options: ~
 
+'pumopt'               Additional options for the popup menu
 'statuslineopt'                Extra window-local options for the 
'statusline', to
                        configure the height.
 't_BS'                 Begin synchronized update.
diff --git a/runtime/optwin.vim b/runtime/optwin.vim
index e20fda26b..522ffed54 100644
--- a/runtime/optwin.vim
+++ b/runtime/optwin.vim
@@ -1,7 +1,7 @@
 " These commands create the option window.
 "
 " Maintainer:  The Vim Project <https://github.com/vim/vim>
-" Last Change: 2026 Mar 11
+" Last Change: 2026 Apr 07
 " Former Maintainer:   Bram Moolenaar <[email protected]>
 
 " If there already is an option window, jump to that one.
@@ -913,6 +913,8 @@ if has("insert_expand")
   call <SID>OptionG("pmw", &pmw)
   call <SID>AddOption("pumborder", gettext("popup border style"))
   call <SID>OptionG("pb", &pb)
+  call <SID>AddOption("pumopt", gettext("additional options for the popup 
menu"))
+  call <SID>OptionG("pumopt", &pumopt)
   call <SID>AddOption("completefunc", gettext("user defined function for 
Insert mode completion"))
   call append("$", "   " .. s:local_to_buffer)
   call <SID>OptionL("cfu")
diff --git a/runtime/syntax/vim.vim b/runtime/syntax/vim.vim
index ed7ce5fb0..6b0658e3d 100644
--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -2,7 +2,7 @@
 " Language:       Vim script
 " Maintainer:     Hirohito Higashi <h.east.727 ATMARK gmail.com>
 "         Doug Kearns <[email protected]>
-" Last Change:    2026 Mar 13
+" Last Change:    2026 Apr 07
 " Former Maintainer: Charles E. Campbell
 
 " DO NOT CHANGE DIRECTLY.
@@ -69,10 +69,10 @@ syn keyword vimOption contained co columns com comments cms 
commentstring cp com
 syn keyword vimOption contained efm errorformat ek esckeys ei eventignore eiw 
eventignorewin et expandtab ex exrc fenc fileencoding fencs fileencodings ff 
fileformat ffs fileformats fic fileignorecase ft filetype fcs fillchars ffu 
findfunc fixeol fixendofline fcl foldclose fdc foldcolumn fen foldenable fde 
foldexpr fdi foldignore fdl foldlevel fdls foldlevelstart fmr foldmarker fdm 
foldmethod fml foldminlines fdn foldnestmax fdo foldopen fdt foldtext fex 
formatexpr flp formatlistpat fo formatoptions fp formatprg fs fsync gd gdefault 
gfm grepformat gp grepprg gcr guicursor gfn guifont gfs guifontset gfw 
guifontwide ghr guiheadroom gli guiligatures go guioptions guipty gtl 
guitablabel gtt guitabtooltip hf helpfile hh helpheight hlg helplang hid hidden 
hl highlight skipwhite nextgroup=vimSetEqual,vimSetMod
 syn keyword vimOption contained hi history hk hkmap hkp hkmapp hls hlsearch 
icon iconstring ic ignorecase imaf imactivatefunc imak imactivatekey imc 
imcmdline imd imdisable imi iminsert ims imsearch imsf imstatusfunc imst 
imstyle inc include inex includeexpr is incsearch inde indentexpr indk 
indentkeys inf infercase im insertmode isf isfname isi isident isk iskeyword 
isp isprint js joinspaces jop jumpoptions key kmp keymap km keymodel kpc 
keyprotocol kp keywordprg lmap langmap lm langmenu lnr langnoremap lrm 
langremap ls laststatus lz lazyredraw lhi lhistory lbr linebreak lines lsp 
linespace lisp lop lispoptions lw lispwords list lcs listchars lpl loadplugins 
luadll magic mef makeef menc makeencoding mp makeprg mps matchpairs mat 
matchtime mco maxcombine mfd maxfuncdepth skipwhite 
nextgroup=vimSetEqual,vimSetMod
 syn keyword vimOption contained mmd maxmapdepth mm maxmem mmp maxmempattern 
mmt maxmemtot msc maxsearchcount mis menuitems mopt messagesopt msm mkspellmem 
ml modeline mle modelineexpr mls modelines ma modifiable mod modified more 
mouse mousef mousefocus mh mousehide mousem mousemodel mousemev mousemoveevent 
mouses mouseshape mouset mousetime mzq mzquantum mzschemedll mzschemegcdll nf 
nrformats nu number nuw numberwidth ofu omnifunc odev opendevice opfunc 
operatorfunc ost osctimeoutlen pp packpath para paragraphs paste pt pastetoggle 
pex patchexpr pm patchmode pa path perldll pi preserveindent pvh previewheight 
pvp previewpopup pvw previewwindow pdev printdevice penc printencoding pexpr 
printexpr pfn printfont pheader printheader pmbcs printmbcharset pmbfn 
printmbfont skipwhite nextgroup=vimSetEqual,vimSetMod
-syn keyword vimOption contained popt printoptions prompt pb pumborder ph 
pumheight pmw pummaxwidth pw pumwidth pythondll pythonhome pythonthreedll 
pythonthreehome pyx pyxversion qftf quickfixtextfunc qe quoteescape ro readonly 
rdt redrawtime re regexpengine rnu relativenumber remap rop renderoptions 
report rs restorescreen ri revins rl rightleft rlc rightleftcmd rubydll ru 
ruler ruf rulerformat rtp runtimepath scr scroll scb scrollbind scf scrollfocus 
sj scrolljump so scrolloff sbo scrollopt sect sections secure sel selection slm 
selectmode ssop sessionoptions sh shell shcf shellcmdflag sp shellpipe shq 
shellquote srr shellredir ssl shellslash stmp shelltemp st shelltype sxe 
shellxescape sxq shellxquote sr shiftround sw shiftwidth shm shortmess sn 
shortname sbr showbreak skipwhite nextgroup=vimSetEqual,vimSetMod
-syn keyword vimOption contained sc showcmd sloc showcmdloc sft showfulltag sm 
showmatch smd showmode stal showtabline stpl showtabpanel ss sidescroll siso 
sidescrolloff scl signcolumn scs smartcase si smartindent sta smarttab sms 
smoothscroll sts softtabstop spell spc spellcapcheck spf spellfile spl 
spelllang spo spelloptions sps spellsuggest sb splitbelow spk splitkeep spr 
splitright sol startofline stl statusline stlo statuslineopt su suffixes sua 
suffixesadd swf swapfile sws swapsync swb switchbuf smc synmaxcol syn syntax 
tcl tabclose tal tabline tpm tabpagemax tpl tabpanel tplo tabpanelopt ts 
tabstop tbs tagbsearch tc tagcase tfu tagfunc tl taglength tr tagrelative tag 
tags tgst tagstack tcldll term tbidi termbidi tenc termencoding tgc 
termguicolors trz termresize skipwhite nextgroup=vimSetEqual,vimSetMod
-syn keyword vimOption contained tsy termsync twk termwinkey twsl termwinscroll 
tws termwinsize twt termwintype terse ta textauto tx textmode tw textwidth tsr 
thesaurus tsrfu thesaurusfunc top tildeop to timeout tm timeoutlen title 
titlelen titleold titlestring tb toolbar tbis toolbariconsize ttimeout ttm 
ttimeoutlen tbi ttybuiltin tf ttyfast ttym ttymouse tsl ttyscroll tty ttytype 
udir undodir udf undofile ul undolevels ur undoreload uc updatecount ut 
updatetime vsts varsofttabstop vts vartabstop vbs verbose vfile verbosefile 
vdir viewdir vop viewoptions vi viminfo vif viminfofile ve virtualedit vb 
visualbell warn wiv weirdinvert ww whichwrap wc wildchar wcm wildcharm wig 
wildignore wic wildignorecase wmnu wildmenu wim wildmode wop wildoptions wak 
winaltkeys wcr wincolor skipwhite nextgroup=vimSetEqual,vimSetMod
-syn keyword vimOption contained wi window wfb winfixbuf wfh winfixheight wfw 
winfixwidth wh winheight whl winhighlight wmh winminheight wmw winminwidth 
winptydll wiw winwidth wse wlseat wst wlsteal wtm wltimeoutlen wrap wm 
wrapmargin ws wrapscan write wa writeany wb writebackup wd writedelay 
xtermcodes skipwhite nextgroup=vimSetEqual,vimSetMod
+syn keyword vimOption contained popt printoptions prompt pb pumborder ph 
pumheight pmw pummaxwidth pumopt pw pumwidth pythondll pythonhome 
pythonthreedll pythonthreehome pyx pyxversion qftf quickfixtextfunc qe 
quoteescape ro readonly rdt redrawtime re regexpengine rnu relativenumber remap 
rop renderoptions report rs restorescreen ri revins rl rightleft rlc 
rightleftcmd rubydll ru ruler ruf rulerformat rtp runtimepath scr scroll scb 
scrollbind scf scrollfocus sj scrolljump so scrolloff sbo scrollopt sect 
sections secure sel selection slm selectmode ssop sessionoptions sh shell shcf 
shellcmdflag sp shellpipe shq shellquote srr shellredir ssl shellslash stmp 
shelltemp st shelltype sxe shellxescape sxq shellxquote sr shiftround sw 
shiftwidth shm shortmess sn shortname skipwhite nextgroup=vimSetEqual,vimSetMod
+syn keyword vimOption contained sbr showbreak sc showcmd sloc showcmdloc sft 
showfulltag sm showmatch smd showmode stal showtabline stpl showtabpanel ss 
sidescroll siso sidescrolloff scl signcolumn scs smartcase si smartindent sta 
smarttab sms smoothscroll sts softtabstop spell spc spellcapcheck spf spellfile 
spl spelllang spo spelloptions sps spellsuggest sb splitbelow spk splitkeep spr 
splitright sol startofline stl statusline stlo statuslineopt su suffixes sua 
suffixesadd swf swapfile sws swapsync swb switchbuf smc synmaxcol syn syntax 
tcl tabclose tal tabline tpm tabpagemax tpl tabpanel tplo tabpanelopt ts 
tabstop tbs tagbsearch tc tagcase tfu tagfunc tl taglength tr tagrelative tag 
tags tgst tagstack tcldll term tbidi termbidi tenc termencoding tgc 
termguicolors skipwhite nextgroup=vimSetEqual,vimSetMod
+syn keyword vimOption contained trz termresize tsy termsync twk termwinkey 
twsl termwinscroll tws termwinsize twt termwintype terse ta textauto tx 
textmode tw textwidth tsr thesaurus tsrfu thesaurusfunc top tildeop to timeout 
tm timeoutlen title titlelen titleold titlestring tb toolbar tbis 
toolbariconsize ttimeout ttm ttimeoutlen tbi ttybuiltin tf ttyfast ttym 
ttymouse tsl ttyscroll tty ttytype udir undodir udf undofile ul undolevels ur 
undoreload uc updatecount ut updatetime vsts varsofttabstop vts vartabstop vbs 
verbose vfile verbosefile vdir viewdir vop viewoptions vi viminfo vif 
viminfofile ve virtualedit vb visualbell warn wiv weirdinvert ww whichwrap wc 
wildchar wcm wildcharm wig wildignore wic wildignorecase wmnu wildmenu wim 
wildmode wop wildoptions wak winaltkeys skipwhite 
nextgroup=vimSetEqual,vimSetMod
+syn keyword vimOption contained wcr wincolor wi window wfb winfixbuf wfh 
winfixheight wfw winfixwidth wh winheight whl winhighlight wmh winminheight wmw 
winminwidth winptydll wiw winwidth wse wlseat wst wlsteal wtm wltimeoutlen wrap 
wm wrapmargin ws wrapscan write wa writeany wb writebackup wd writedelay 
xtermcodes skipwhite nextgroup=vimSetEqual,vimSetMod
 
 " vimOptions: These are the turn-off setting variants {{{2
 " GEN_SYN_VIM: vimOption turn-off, START_STR='syn keyword vimOption 
contained', END_STR=''
@@ -108,10 +108,10 @@ syn keyword vimOptionVarName contained co columns com 
comments cms commentstring
 syn keyword vimOptionVarName contained efm errorformat ek esckeys ei 
eventignore eiw eventignorewin et expandtab ex exrc fenc fileencoding fencs 
fileencodings ff fileformat ffs fileformats fic fileignorecase ft filetype fcs 
fillchars ffu findfunc fixeol fixendofline fcl foldclose fdc foldcolumn fen 
foldenable fde foldexpr fdi foldignore fdl foldlevel fdls foldlevelstart fmr 
foldmarker fdm foldmethod fml foldminlines fdn foldnestmax fdo foldopen fdt 
foldtext fex formatexpr flp formatlistpat fo formatoptions fp formatprg fs 
fsync gd gdefault gfm grepformat gp grepprg gcr guicursor gfn guifont gfs 
guifontset gfw guifontwide ghr guiheadroom gli guiligatures go guioptions 
guipty gtl guitablabel gtt guitabtooltip hf helpfile hh helpheight hlg helplang 
hid hidden hl highlight
 syn keyword vimOptionVarName contained hi history hk hkmap hkp hkmapp hls 
hlsearch icon iconstring ic ignorecase imaf imactivatefunc imak imactivatekey 
imc imcmdline imd imdisable imi iminsert ims imsearch imsf imstatusfunc imst 
imstyle inc include inex includeexpr is incsearch inde indentexpr indk 
indentkeys inf infercase im insertmode isf isfname isi isident isk iskeyword 
isp isprint js joinspaces jop jumpoptions key kmp keymap km keymodel kpc 
keyprotocol kp keywordprg lmap langmap lm langmenu lnr langnoremap lrm 
langremap ls laststatus lz lazyredraw lhi lhistory lbr linebreak lines lsp 
linespace lisp lop lispoptions lw lispwords list lcs listchars lpl loadplugins 
luadll magic mef makeef menc makeencoding mp makeprg mps matchpairs mat 
matchtime mco maxcombine
 syn keyword vimOptionVarName contained mfd maxfuncdepth mmd maxmapdepth mm 
maxmem mmp maxmempattern mmt maxmemtot msc maxsearchcount mis menuitems mopt 
messagesopt msm mkspellmem ml modeline mle modelineexpr mls modelines ma 
modifiable mod modified more mouse mousef mousefocus mh mousehide mousem 
mousemodel mousemev mousemoveevent mouses mouseshape mouset mousetime mzq 
mzquantum mzschemedll mzschemegcdll nf nrformats nu number nuw numberwidth ofu 
omnifunc odev opendevice opfunc operatorfunc ost osctimeoutlen pp packpath para 
paragraphs paste pt pastetoggle pex patchexpr pm patchmode pa path perldll pi 
preserveindent pvh previewheight pvp previewpopup pvw previewwindow pdev 
printdevice penc printencoding pexpr printexpr pfn printfont pheader 
printheader pmbcs printmbcharset
-syn keyword vimOptionVarName contained pmbfn printmbfont popt printoptions 
prompt pb pumborder ph pumheight pmw pummaxwidth pw pumwidth pythondll 
pythonhome pythonthreedll pythonthreehome pyx pyxversion qftf quickfixtextfunc 
qe quoteescape ro readonly rdt redrawtime re regexpengine rnu relativenumber 
remap rop renderoptions report rs restorescreen ri revins rl rightleft rlc 
rightleftcmd rubydll ru ruler ruf rulerformat rtp runtimepath scr scroll scb 
scrollbind scf scrollfocus sj scrolljump so scrolloff sbo scrollopt sect 
sections secure sel selection slm selectmode ssop sessionoptions sh shell shcf 
shellcmdflag sp shellpipe shq shellquote srr shellredir ssl shellslash stmp 
shelltemp st shelltype sxe shellxescape sxq shellxquote sr shiftround sw 
shiftwidth shm shortmess
-syn keyword vimOptionVarName contained sn shortname sbr showbreak sc showcmd 
sloc showcmdloc sft showfulltag sm showmatch smd showmode stal showtabline stpl 
showtabpanel ss sidescroll siso sidescrolloff scl signcolumn scs smartcase si 
smartindent sta smarttab sms smoothscroll sts softtabstop spell spc 
spellcapcheck spf spellfile spl spelllang spo spelloptions sps spellsuggest sb 
splitbelow spk splitkeep spr splitright sol startofline stl statusline stlo 
statuslineopt su suffixes sua suffixesadd swf swapfile sws swapsync swb 
switchbuf smc synmaxcol syn syntax tcl tabclose tal tabline tpm tabpagemax tpl 
tabpanel tplo tabpanelopt ts tabstop tbs tagbsearch tc tagcase tfu tagfunc tl 
taglength tr tagrelative tag tags tgst tagstack tcldll term tbidi termbidi tenc 
termencoding
-syn keyword vimOptionVarName contained tgc termguicolors trz termresize tsy 
termsync twk termwinkey twsl termwinscroll tws termwinsize twt termwintype 
terse ta textauto tx textmode tw textwidth tsr thesaurus tsrfu thesaurusfunc 
top tildeop to timeout tm timeoutlen title titlelen titleold titlestring tb 
toolbar tbis toolbariconsize ttimeout ttm ttimeoutlen tbi ttybuiltin tf ttyfast 
ttym ttymouse tsl ttyscroll tty ttytype udir undodir udf undofile ul undolevels 
ur undoreload uc updatecount ut updatetime vsts varsofttabstop vts vartabstop 
vbs verbose vfile verbosefile vdir viewdir vop viewoptions vi viminfo vif 
viminfofile ve virtualedit vb visualbell warn wiv weirdinvert ww whichwrap wc 
wildchar wcm wildcharm wig wildignore wic wildignorecase wmnu wildmenu wim 
wildmode
-syn keyword vimOptionVarName contained wop wildoptions wak winaltkeys wcr 
wincolor wi window wfb winfixbuf wfh winfixheight wfw winfixwidth wh winheight 
whl winhighlight wmh winminheight wmw winminwidth winptydll wiw winwidth wse 
wlseat wst wlsteal wtm wltimeoutlen wrap wm wrapmargin ws wrapscan write wa 
writeany wb writebackup wd writedelay xtermcodes
+syn keyword vimOptionVarName contained pmbfn printmbfont popt printoptions 
prompt pb pumborder ph pumheight pmw pummaxwidth pumopt pw pumwidth pythondll 
pythonhome pythonthreedll pythonthreehome pyx pyxversion qftf quickfixtextfunc 
qe quoteescape ro readonly rdt redrawtime re regexpengine rnu relativenumber 
remap rop renderoptions report rs restorescreen ri revins rl rightleft rlc 
rightleftcmd rubydll ru ruler ruf rulerformat rtp runtimepath scr scroll scb 
scrollbind scf scrollfocus sj scrolljump so scrolloff sbo scrollopt sect 
sections secure sel selection slm selectmode ssop sessionoptions sh shell shcf 
shellcmdflag sp shellpipe shq shellquote srr shellredir ssl shellslash stmp 
shelltemp st shelltype sxe shellxescape sxq shellxquote sr shiftround sw 
shiftwidth
+syn keyword vimOptionVarName contained shm shortmess sn shortname sbr 
showbreak sc showcmd sloc showcmdloc sft showfulltag sm showmatch smd showmode 
stal showtabline stpl showtabpanel ss sidescroll siso sidescrolloff scl 
signcolumn scs smartcase si smartindent sta smarttab sms smoothscroll sts 
softtabstop spell spc spellcapcheck spf spellfile spl spelllang spo 
spelloptions sps spellsuggest sb splitbelow spk splitkeep spr splitright sol 
startofline stl statusline stlo statuslineopt su suffixes sua suffixesadd swf 
swapfile sws swapsync swb switchbuf smc synmaxcol syn syntax tcl tabclose tal 
tabline tpm tabpagemax tpl tabpanel tplo tabpanelopt ts tabstop tbs tagbsearch 
tc tagcase tfu tagfunc tl taglength tr tagrelative tag tags tgst tagstack 
tcldll term tbidi termbidi
+syn keyword vimOptionVarName contained tenc termencoding tgc termguicolors trz 
termresize tsy termsync twk termwinkey twsl termwinscroll tws termwinsize twt 
termwintype terse ta textauto tx textmode tw textwidth tsr thesaurus tsrfu 
thesaurusfunc top tildeop to timeout tm timeoutlen title titlelen titleold 
titlestring tb toolbar tbis toolbariconsize ttimeout ttm ttimeoutlen tbi 
ttybuiltin tf ttyfast ttym ttymouse tsl ttyscroll tty ttytype udir undodir udf 
undofile ul undolevels ur undoreload uc updatecount ut updatetime vsts 
varsofttabstop vts vartabstop vbs verbose vfile verbosefile vdir viewdir vop 
viewoptions vi viminfo vif viminfofile ve virtualedit vb visualbell warn wiv 
weirdinvert ww whichwrap wc wildchar wcm wildcharm wig wildignore wic 
wildignorecase wmnu wildmenu
+syn keyword vimOptionVarName contained wim wildmode wop wildoptions wak 
winaltkeys wcr wincolor wi window wfb winfixbuf wfh winfixheight wfw 
winfixwidth wh winheight whl winhighlight wmh winminheight wmw winminwidth 
winptydll wiw winwidth wse wlseat wst wlsteal wtm wltimeoutlen wrap wm 
wrapmargin ws wrapscan write wa writeany wb writebackup wd writedelay xtermcodes
 " GEN_SYN_VIM: vimOption term output code variable, START_STR='syn keyword 
vimOptionVarName contained', END_STR=''
 syn keyword vimOptionVarName contained t_AB t_AF t_AU t_AL t_al t_bc t_BE t_BD 
t_cd t_ce t_Ce t_CF t_cl t_cm t_Co t_CS t_Cs t_cs t_CV t_da t_db t_DL t_dl t_ds 
t_Ds t_EC t_EI t_fs t_fd t_fe t_GP t_IE t_IS t_ke t_ks t_le t_mb t_md t_me t_mr 
t_ms t_nd t_op t_RF t_RB t_RC t_RI t_Ri t_RK t_RS t_RT t_RV t_Sb t_SC t_se t_Sf 
t_SH t_SI t_Si t_so t_SR t_sr t_ST t_Te t_te t_TE t_ti t_TI t_Ts t_ts t_u7 t_ue 
t_us t_Us t_ut t_vb t_ve t_vi t_VS t_vs t_WP t_WS t_XM t_xn t_xs t_ZH t_ZR t_8f 
t_8b t_8u t_xo t_BS t_ES
 syn keyword vimOptionVarName contained t_F1 t_F2 t_F3 t_F4 t_F5 t_F6 t_F7 t_F8 
t_F9 t_k1 t_K1 t_k2 t_k3 t_K3 t_k4 t_K4 t_k5 t_K5 t_k6 t_K6 t_k7 t_K7 t_k8 t_K8 
t_k9 t_K9 t_KA t_kb t_kB t_KB t_KC t_kd t_kD t_KD t_KE t_KF t_KG t_kh t_KH t_kI 
t_KI t_KJ t_KK t_kl t_KL t_kN t_kP t_kr t_ku
diff --git a/src/globals.h b/src/globals.h
index 4b6d2dfe3..b7533c632 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -125,6 +125,23 @@ EXTERN int screen_zindex INIT(= 0);
 EXTERN win_T   *screen_opacity_popup INIT(= NULL);
 #endif
 
+// Pum opacity level (0 = fully transparent, 100 = fully opaque).
+// Set via 'pumopt' opacity: key.
+EXTERN long    p_po INIT(= 100);
+
+// Blend value for popup menu opacity (0 = off, 1-99 = blend level).
+// Set during pum drawing when pum opacity is active.
+EXTERN int     screen_pum_blend INIT(= 0);
+
+// Saved background screen content for pum opacity blending.
+EXTERN sattr_T *pum_bg_attrs INIT(= NULL);
+EXTERN schar_T *pum_bg_lines INIT(= NULL);
+EXTERN u8char_T        *pum_bg_linesUC INIT(= NULL);
+EXTERN u8char_T        *pum_bg_linesC[MAX_MCO];
+EXTERN int     pum_bg_top INIT(= 0);
+EXTERN int     pum_bg_bot INIT(= 0);
+EXTERN int     pum_bg_cols INIT(= 0);
+
 EXTERN int     screen_Rows INIT(= 0);      // actual size of ScreenLines[]
 EXTERN int     screen_Columns INIT(= 0);   // actual size of ScreenLines[]
 
diff --git a/src/highlight.c b/src/highlight.c
index 28b7c6be1..cf5921f4b 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -3321,6 +3321,138 @@ hl_blend_attr(int char_attr, int popup_attr, int blend, 
int blend_fg UNUSED)
     return get_attr_entry(&term_attr_table, &new_en);
 }
 
+/*
+ * Blend for pum opacity space cells: keep underlying fg, blend bg.
+ * This is different from hl_blend_attr(blend_fg=TRUE) where fg blends
+ * in the wrong direction for pum use.
+ */
+    int
+hl_pum_blend_attr(int char_attr, int popup_attr, int blend UNUSED)
+{
+    attrentry_T *char_aep = NULL;
+    attrentry_T *popup_aep;
+    attrentry_T new_en;
+
+#ifdef FEAT_GUI
+    if (gui.in_use)
+    {
+       if (char_attr > HL_ALL)
+           char_aep = syn_gui_attr2entry(char_attr);
+       if (char_aep != NULL)
+           new_en = *char_aep;
+       else
+       {
+           CLEAR_FIELD(new_en);
+           new_en.ae_u.gui.fg_color = INVALCOLOR;
+           new_en.ae_u.gui.bg_color = INVALCOLOR;
+           new_en.ae_u.gui.sp_color = INVALCOLOR;
+           if (char_attr <= HL_ALL)
+               new_en.ae_attr = char_attr;
+       }
+       if (popup_attr > HL_ALL)
+       {
+           popup_aep = syn_gui_attr2entry(popup_attr);
+           if (popup_aep != NULL)
+           {
+               // Blend fg: pum_bg toward underlying_fg.
+               // blend=0 (opaque): fg = pum_bg (text hidden)
+               // blend=100 (transparent): fg = underlying_fg (text visible)
+               if (popup_aep->ae_u.gui.bg_color != INVALCOLOR)
+               {
+                   int base_fg = 0xFFFFFF;
+                   if (char_aep != NULL
+                           && char_aep->ae_u.gui.fg_color != INVALCOLOR)
+                       base_fg = char_aep->ae_u.gui.fg_color;
+                   new_en.ae_u.gui.fg_color = blend_colors(
+                           popup_aep->ae_u.gui.bg_color, base_fg, blend);
+               }
+               // Blend bg: popup bg toward underlying bg.
+               if (popup_aep->ae_u.gui.bg_color != INVALCOLOR)
+               {
+                   guicolor_T underlying_bg = INVALCOLOR;
+                   if (char_aep != NULL)
+                       underlying_bg = char_aep->ae_u.gui.bg_color;
+                   new_en.ae_u.gui.bg_color = blend_colors(
+                           popup_aep->ae_u.gui.bg_color,
+                           underlying_bg, blend);
+               }
+           }
+       }
+       return get_attr_entry(&gui_attr_table, &new_en);
+    }
+#endif
+
+    if (IS_CTERM)
+    {
+       if (char_attr > HL_ALL)
+           char_aep = syn_cterm_attr2entry(char_attr);
+       if (char_aep != NULL)
+           new_en = *char_aep;
+       else
+       {
+           CLEAR_FIELD(new_en);
+#ifdef FEAT_TERMGUICOLORS
+           new_en.ae_u.cterm.bg_rgb = INVALCOLOR;
+           new_en.ae_u.cterm.fg_rgb = INVALCOLOR;
+           new_en.ae_u.cterm.ul_rgb = INVALCOLOR;
+#endif
+           if (char_attr <= HL_ALL)
+               new_en.ae_attr = char_attr;
+       }
+       if (popup_attr > HL_ALL)
+       {
+           popup_aep = syn_cterm_attr2entry(popup_attr);
+           if (popup_aep != NULL)
+           {
+               // Blend cterm fg: use popup bg (hides text when opaque)
+               if (popup_aep->ae_u.cterm.fg_color > 0)
+                   new_en.ae_u.cterm.fg_color =
+                                       popup_aep->ae_u.cterm.fg_color;
+               // Use popup cterm bg.
+               if (popup_aep->ae_u.cterm.bg_color > 0)
+                   new_en.ae_u.cterm.bg_color =
+                                       popup_aep->ae_u.cterm.bg_color;
+#ifdef FEAT_TERMGUICOLORS
+               // Blend fg_rgb: pum_bg toward underlying_fg.
+               if (popup_aep->ae_u.cterm.bg_rgb != INVALCOLOR)
+               {
+                   int base_fg = 0xFFFFFF;
+                   if (char_aep != NULL
+                           && char_aep->ae_u.cterm.fg_rgb != INVALCOLOR)
+                       base_fg = char_aep->ae_u.cterm.fg_rgb;
+                   new_en.ae_u.cterm.fg_rgb = blend_colors(
+                           popup_aep->ae_u.cterm.bg_rgb, base_fg, blend);
+               }
+               // Blend bg_rgb.
+               if (popup_aep->ae_u.cterm.bg_rgb != INVALCOLOR)
+               {
+                   guicolor_T underlying_bg = INVALCOLOR;
+                   if (char_aep != NULL)
+                       underlying_bg = char_aep->ae_u.cterm.bg_rgb;
+                   new_en.ae_u.cterm.bg_rgb = blend_colors(
+                           popup_aep->ae_u.cterm.bg_rgb,
+                           underlying_bg, blend);
+               }
+#endif
+           }
+       }
+       return get_attr_entry(&cterm_attr_table, &new_en);
+    }
+
+    // term mode
+    if (char_attr > HL_ALL)
+       char_aep = syn_term_attr2entry(char_attr);
+    if (char_aep != NULL)
+       new_en = *char_aep;
+    else
+    {
+       CLEAR_FIELD(new_en);
+       if (char_attr <= HL_ALL)
+           new_en.ae_attr = char_attr;
+    }
+    return get_attr_entry(&term_attr_table, &new_en);
+}
+
 #ifdef FEAT_GUI
     attrentry_T *
 syn_gui_attr2entry(int attr)
diff --git a/src/option.h b/src/option.h
index 305a92ad8..adafbd8d3 100644
--- a/src/option.h
+++ b/src/option.h
@@ -556,6 +556,7 @@ EXTERN long p_ph;           // 'pumheight'
 EXTERN long    p_pw;           // 'pumwidth'
 EXTERN long    p_pmw;          // 'pummaxwidth'
 EXTERN char_u  *p_pb;          // 'pumborder'
+EXTERN char_u  *p_pumopt;      // 'pumopt'
 EXTERN char_u  *p_com;         // 'comments'
 EXTERN char_u  *p_cpo;         // 'cpoptions'
 #ifdef FEAT_CSCOPE
diff --git a/src/optiondefs.h b/src/optiondefs.h
index a6f838308..a5e1fe99d 100644
--- a/src/optiondefs.h
+++ b/src/optiondefs.h
@@ -2091,6 +2091,10 @@ static struct vimoption options[] =
     {"pummaxwidth", "pmw",   P_NUM|P_VI_DEF,
                            (char_u *)&p_pmw, PV_NONE, NULL, NULL,
                            {(char_u *)0L, (char_u *)0L} SCTX_INIT},
+    {"pumopt",     NULL,   P_STRING|P_VI_DEF|P_COMMA|P_NODUP|P_COLON,
+                           (char_u *)&p_pumopt, PV_NONE,
+                           did_set_pumopt, expand_set_pumopt,
+                           {(char_u *)"", (char_u *)NULL} SCTX_INIT},
     {"pumwidth",    "pw",   P_NUM|P_VI_DEF,
                            (char_u *)&p_pw, PV_NONE, NULL, NULL,
                            {(char_u *)15L, (char_u *)15L} SCTX_INIT},
diff --git a/src/optionstr.c b/src/optionstr.c
index 8f964b983..9647f7c01 100644
--- a/src/optionstr.c
+++ b/src/optionstr.c
@@ -3697,114 +3697,249 @@ expand_set_rightleftcmd(optexpand_T *args, int 
*numMatches, char_u ***matches)
     } while (0)
 
 /*
- * The 'pumborder' option is changed.
- * Rules:
- *   - One of { single, double, round, ascii, custom:XXXXXXXX } may appear.
- *   - "margin" may appear, but only together with exactly one border style.
- *   - "shadow" is independent and can be combined freely.
+ * Parse a border value from a pumopt "border:" token.
+ * Returns OK on success, FAIL on error.
  */
-    char *
-did_set_pumborder(optset_T *args)
+    static int
+parse_pumopt_border(char_u *val, int len)
 {
-    char_u  **varp = (char_u **)args->os_varp;
     // Use box-drawing characters only when 'encoding' is "utf-8" and
     // 'ambiwidth' is "single".
     int            can_use_box_chars = (enc_utf8 && *p_ambw == 's');
-    char_u  *p, *token;
-    int            len;
+    char_u  *token;
+
+    token = vim_strnsave(val, len);
+    if (token == NULL)
+       return FAIL;
+
+    if (can_use_box_chars && STRCMP(token, "single") == 0)
+       pum_set_border_chars(0x2500, 0x2502, 0x2500, 0x2502, // ─ │ ─ │
+               0x250c, 0x2510, 0x2518, 0x2514); // ┌ ┐ ┘ └
+    else if (can_use_box_chars && STRCMP(token, "double") == 0)
+       pum_set_border_chars(0x2550, 0x2551, 0x2550, 0x2551, // ═ ║ ═ ║
+               0x2554, 0x2557, 0x255D, 0x255A); // ╔ ╗ ╝  ╚
+    else if (can_use_box_chars && STRCMP(token, "round") == 0)
+       pum_set_border_chars(0x2500, 0x2502, 0x2500, 0x2502, // ─ │ ─ │
+               0x256d, 0x256e, 0x256f, 0x2570); // ╭ ╮ ╯ ╰
+    else if (STRCMP(token, "ascii") == 0)
+       pum_set_border_chars('-', '|', '-', '|', '+', '+', '+', '+');
+    else if (STRNCMP(token, "custom:", 7) == 0)
+    {
+       char_u  *q = token + 7;
+       int     out[8];
+
+       for (int i = 0; i < 8; i++)
+       {
+           if (*q == NUL || *q == ',')
+           {
+               vim_free(token);
+               return FAIL;
+           }
+           out[i] = mb_ptr2char(q);
+           mb_ptr2char_adv(&q);
+           if (i < 7)
+           {
+               if (*q != ';')
+               {
+                   vim_free(token);
+                   return FAIL;
+               }
+               q++;
+           }
+       }
+       if (*q != NUL && *q != ',')
+       {
+           vim_free(token);
+           return FAIL;
+       }
+       pum_set_border_chars(out[0], out[1], out[2], out[3], out[4], out[5],
+               out[6], out[7]);
+    }
+    else
+    {
+       vim_free(token);
+       return FAIL;
+    }
+
+    vim_free(token);
+    pum_set_border(TRUE);
+    return OK;
+}
+
+/*
+ * The 'pumopt' option is changed.
+ * Format: comma-separated key:value pairs.
+ *   border:{single|double|round|ascii|custom:X;X;X;X;X;X;X;X}
+ *   height:{n}
+ *   width:{n}
+ *   maxwidth:{n}
+ *   opacity:{n}
+ *   shadow
+ *   margin (requires border)
+ */
+    char *
+did_set_pumopt(optset_T *args)
+{
+    char_u  **varp = (char_u **)args->os_varp;
+    char_u  *p;
     int            have_border = FALSE;
     int            have_margin = FALSE;
 
+    // Reset to defaults.
     PUM_BORDER_CLEAR();
+    p_ph = 0;
+    p_pw = 15;
+    p_pmw = 0;
+    p_po = 100;
 
     if (*varp == NULL || **varp == NUL)
        return NULL;
 
     for (p = *varp; p != NULL && *p != NUL; )
     {
-       // end of token is either ',' or NUL
        char_u *comma = vim_strchr(p, ',');
+       int len;
+
        if (comma != NULL)
            len = (int)(comma - p);
        else
            len = (int)STRLEN(p);
 
-       token = vim_strnsave(p, len);
-       if (token == NULL)
-           goto error;
-
-       if ((can_use_box_chars && (STRCMP(token, "single") == 0
-                       || STRCMP(token, "double") == 0
-                       || STRCMP(token, "round") == 0))
-               || STRCMP(token, "ascii") == 0
-               || (STRNCMP(token, "custom:", 7) == 0))
+       if (STRNCMP(p, "border:", 7) == 0)
        {
            if (have_border)
-           {
-               // multiple border styles not allowed
-               vim_free(token);
                goto error;
-           }
            have_border = TRUE;
+           if (parse_pumopt_border(p + 7, len - 7) == FAIL)
+               goto error;
+       }
+       else if (STRNCMP(p, "height:", 7) == 0)
+       {
+           long n = atol((char *)p + 7);
+           if (n < 0)
+               goto error;
+           p_ph = n;
+       }
+       else if (STRNCMP(p, "width:", 6) == 0)
+       {
+           long n = atol((char *)p + 6);
+           if (n < 0)
+               goto error;
+           p_pw = n;
+       }
+       else if (STRNCMP(p, "maxwidth:", 9) == 0)
+       {
+           long n = atol((char *)p + 9);
+           if (n < 0)
+               goto error;
+           p_pmw = n;
+       }
+       else if (STRNCMP(p, "opacity:", 8) == 0)
+       {
+           long n = atol((char *)p + 8);
+           if (n < 0 || n > 100)
+               goto error;
+           p_po = n;
+       }
+       else if (len == 6 && STRNCMP(p, "shadow", 6) == 0)
+           pum_set_shadow(TRUE);
+       else if (len == 6 && STRNCMP(p, "margin", 6) == 0)
+       {
+           have_margin = TRUE;
+           pum_set_margin(TRUE);
+       }
+       else
+           goto error;
 
-           if (STRCMP(token, "single") == 0)
-               pum_set_border_chars(0x2500, 0x2502, 0x2500, 0x2502, // ─ │ ─ │
-                       0x250c, 0x2510, 0x2518, 0x2514); // ┌ ┐ ┘ └
-           else if (STRCMP(token, "double") == 0)
-               pum_set_border_chars(0x2550, 0x2551, 0x2550, 0x2551, // ═ ║ ═ ║
-                       0x2554, 0x2557, 0x255D, 0x255A); // ╔ ╗ ╝  ╚
-           else if (STRCMP(token, "round") == 0)
-               pum_set_border_chars(0x2500, 0x2502, 0x2500, 0x2502, // ─ │ ─ │
-                       0x256d, 0x256e, 0x256f, 0x2570); // ╭ ╮ ╯ ╰
-           else if (STRCMP(token, "ascii") == 0)
-               pum_set_border_chars('-', '|', '-', '|', '+', '+', '+', '+');
-           else if (STRNCMP(token, "custom:", 7) == 0)
-           {
-               char_u  *q = token + 7;
-               int     out[8];
+       if (comma != NULL)
+           p = comma + 1;
+       else
+           break;
+    }
 
-               for (int i = 0; i < 8; i++)
-               {
-                   if (*q == NUL || *q == ',')
-                       goto error;
-                   out[i] = mb_ptr2char(q);
-                   mb_ptr2char_adv(&q);
-                   if (i < 7)
-                   {
-                       if (*q != ';')
-                           goto error;  // must be semicolon
-                       q++;
-                   }
-               }
-               if (*q != NUL && *q != ',') // must end exactly after the 8th 
char
-                   goto error;
-               pum_set_border_chars(out[0], out[1], out[2], out[3], out[4], 
out[5],
-                       out[6], out[7]);
-           }
-       }
-       else if (STRCMP(token, "shadow") == 0)
+    if (have_margin && !have_border)
+       goto error;
+
+    // Invalidate cached background for opacity changes.
+    pum_opacity_changed();
+
+    return NULL;
+
+error:
+    PUM_BORDER_CLEAR();
+    p_ph = 0;
+    p_pw = 15;
+    p_pmw = 0;
+    p_po = 100;
+    return e_invalid_argument;
+}
+
+    int
+expand_set_pumopt(optexpand_T *args, int *numMatches, char_u ***matches)
+{
+    static char *(p_pumopt_values[]) = {"border:", "height:", "width:",
+       "maxwidth:", "opacity:", "shadow", "margin", NULL};
+    return expand_set_opt_string(
+           args,
+           p_pumopt_values,
+           ARRAY_LENGTH(p_pumopt_values) - 1,
+           numMatches,
+           matches);
+}
+
+/*
+ * The 'pumborder' option is changed.
+ * Rules:
+ *   - One of { single, double, round, ascii, custom:XXXXXXXX } may appear.
+ *   - "margin" may appear, but only together with exactly one border style.
+ *   - "shadow" is independent and can be combined freely.
+ */
+    char *
+did_set_pumborder(optset_T *args)
+{
+    char_u  **varp = (char_u **)args->os_varp;
+    char_u  *p;
+    int            len;
+    int            have_border = FALSE;
+    int            have_margin = FALSE;
+
+    PUM_BORDER_CLEAR();
+
+    if (*varp == NULL || **varp == NUL)
+       return NULL;
+
+    for (p = *varp; p != NULL && *p != NUL; )
+    {
+       char_u *comma = vim_strchr(p, ',');
+       if (comma != NULL)
+           len = (int)(comma - p);
+       else
+           len = (int)STRLEN(p);
+
+       if (STRNCMP(p, "shadow", len) == 0 && len == 6)
            pum_set_shadow(TRUE);
-       else if (STRCMP(token, "margin") == 0)
+       else if (STRNCMP(p, "margin", len) == 0 && len == 6)
        {
            have_margin = TRUE;
            pum_set_margin(TRUE);
        }
        else
        {
-           vim_free(token);
-           goto error;
+           if (have_border)
+               goto error;
+           have_border = TRUE;
+           if (parse_pumopt_border(p, len) == FAIL)
+               goto error;
        }
 
-       vim_free(token);
-
        if (comma != NULL)
-           p = comma + 1; // move to next token (skip comma)
+           p = comma + 1;
        else
            break;
     }
 
     if (have_margin && !have_border)
-       goto error; // margin must be combined with border
+       goto error;
 
     return NULL;
 
@@ -3817,12 +3952,12 @@ error:
     int
 expand_set_pumborder(optexpand_T *args, int *numMatches, char_u ***matches)
 {
-    static char *(p_rlc_values[]) = {"single", "double", "round", "ascii",
+    static char *(p_pb_values[]) = {"single", "double", "round", "ascii",
        "custom", "shadow", "margin", NULL};
     return expand_set_opt_string(
            args,
-           p_rlc_values,
-           ARRAY_LENGTH(p_rlc_values) - 1,
+           p_pb_values,
+           ARRAY_LENGTH(p_pb_values) - 1,
            numMatches,
            matches);
 }
diff --git a/src/po/vim.pot b/src/po/vim.pot
index 3470fc9e3..b2e3b0f64 100644
--- a/src/po/vim.pot
+++ b/src/po/vim.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Vim
"
 "Report-Msgid-Bugs-To: [email protected]
"
-"POT-Creation-Date: 2026-04-07 18:24+0000
"
+"POT-Creation-Date: 2026-04-07 19:50+0000
"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE
"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>
"
 "Language-Team: LANGUAGE <[email protected]>
"
@@ -10015,6 +10015,9 @@ msgstr ""
 msgid "popup border style"
 msgstr ""
 
+msgid "additional options for the popup menu"
+msgstr ""
+
 msgid "user defined function for Insert mode completion"
 msgstr ""
 
diff --git a/src/popupmenu.c b/src/popupmenu.c
index b8c72d44f..2ee720087 100644
--- a/src/popupmenu.c
+++ b/src/popupmenu.c
@@ -406,11 +406,17 @@ pum_call_update_screen(void)
     int
 pum_under_menu(int row, int col, int only_redrawing)
 {
+    int        extra_left = pum_border + (pum_margin && pum_border ? 1 : 0);
+    int        extra_right = pum_border + (pum_margin && pum_border ? 1 : 0)
+                                               + (pum_shadow ? 2 : 0);
+    int        extra_above = pum_border;
+    int        extra_below = pum_border + (pum_shadow ? 1 : 0);
+
     return (!only_redrawing || pum_will_redraw)
-           && row >= pum_row
-           && row < pum_row + pum_height
-           && col >= pum_col - 1
-           && col < pum_col + pum_width + pum_scrollbar;
+           && row >= pum_row - extra_above
+           && row < pum_row + pum_height + extra_below
+           && col >= pum_col - 1 - extra_left
+           && col < pum_col + pum_width + pum_scrollbar + extra_right;
 }
 
 /*
@@ -878,6 +884,42 @@ pum_align_order(int *order)
     order[2] = is_default ? CPT_MENU : cia_flags % 10;
 }
 
+static void pum_free_bg(void);
+
+/*
+ * Called when the pum opacity value has changed.
+ * Invalidates cached background and triggers redraw if pum is visible.
+ */
+    void
+pum_opacity_changed(void)
+{
+    // Invalidate cached background so it gets re-saved.
+    pum_free_bg();
+
+    if (pum_visible())
+    {
+       // Force full screen clear so ScreenAttrs doesn't retain
+       // stale blended values from the previous pumopacity.
+       redraw_all_later(UPD_CLEAR);
+       call_update_screen = TRUE;
+       pum_redraw();
+    }
+}
+
+    static void
+pum_free_bg(void)
+{
+    int k;
+    VIM_CLEAR(pum_bg_attrs);
+    VIM_CLEAR(pum_bg_lines);
+    VIM_CLEAR(pum_bg_linesUC);
+    for (k = 0; k < MAX_MCO; ++k)
+       VIM_CLEAR(pum_bg_linesC[k]);
+    pum_bg_top = 0;
+    pum_bg_bot = 0;
+    pum_bg_cols = 0;
+}
+
 /*
  * Redraw the popup menu, using "pum_first" and "pum_selected".
  */
@@ -906,6 +948,7 @@ pum_redraw(void)
     int                orig_attr = -1;
     int                scroll_range = pum_size - pum_height;
     bool       override_success;
+    int                opacity_active = (p_po > 0 && p_po < 100);
 
     // Use current window for highlight overrides when using 'winhighlight'
     override_success = push_highlight_overrides(curwin->w_hl, 
curwin->w_hl_len);
@@ -925,11 +968,97 @@ pum_redraw(void)
     if (call_update_screen)
     {
        call_update_screen = FALSE;
-       // Do not redraw in pum_may_redraw() and don't draw in the area where
-       // the popup menu will be.
-       pum_will_redraw = TRUE;
-       update_screen(0);
-       pum_will_redraw = FALSE;
+       // Invalidate cached background if screen size changed (e.g.
+       // after window resize).
+       if (opacity_active && pum_bg_lines != NULL
+               && (pum_bg_cols != screen_Columns
+                   || pum_bg_bot > screen_Rows))
+           pum_free_bg();
+
+       if (opacity_active && pum_bg_lines != NULL)
+       {
+           // Already have saved background; skip update_screen to avoid
+           // flickering.  Just do a normal pum_will_redraw update.
+           pum_will_redraw = TRUE;
+           update_screen(0);
+           pum_will_redraw = FALSE;
+       }
+       else if (opacity_active)
+       {
+           // For opacity: draw background including the area under the
+           // pum, then save it.
+           pum_pretend_not_visible = TRUE;
+           update_screen(0);
+           pum_pretend_not_visible = FALSE;
+
+           // Save background to static buffers.
+           if (ScreenLines != NULL && ScreenAttrs != NULL)
+           {
+               int     save_top, save_bot, save_ncells, k;
+
+               pum_free_bg();
+               save_top = pum_row - pum_border;
+               save_bot = pum_row + pum_height + pum_border
+                                           + (pum_shadow ? 1 : 0) + 1;
+               if (save_top < 0)
+                   save_top = 0;
+               if (save_bot > screen_Rows)
+                   save_bot = screen_Rows;
+               pum_bg_top = save_top;
+               pum_bg_bot = save_bot;
+               pum_bg_cols = screen_Columns;
+               if (save_top < save_bot)
+               {
+                   save_ncells = (save_bot - save_top) * screen_Columns;
+                   pum_bg_attrs = LALLOC_MULT(sattr_T, save_ncells);
+                   pum_bg_lines = LALLOC_MULT(schar_T, save_ncells);
+                   if (enc_utf8)
+                   {
+                       pum_bg_linesUC = LALLOC_MULT(u8char_T, save_ncells);
+                       for (k = 0; k < MAX_MCO; ++k)
+                           pum_bg_linesC[k] = LALLOC_MULT(u8char_T,
+                                                           save_ncells);
+                   }
+                   if (pum_bg_attrs != NULL && pum_bg_lines != NULL)
+                   {
+                       for (int r = save_top; r < save_bot; ++r)
+                       {
+                           int soff = (r - save_top) * screen_Columns;
+                           int loff = LineOffset[r];
+
+                           mch_memmove(pum_bg_attrs + soff,
+                                   ScreenAttrs + loff,
+                                   screen_Columns * sizeof(sattr_T));
+                           mch_memmove(pum_bg_lines + soff,
+                                   ScreenLines + loff,
+                                   screen_Columns * sizeof(schar_T));
+                           if (enc_utf8 && pum_bg_linesUC != NULL
+                                               && ScreenLinesUC != NULL)
+                           {
+                               mch_memmove(pum_bg_linesUC + soff,
+                                       ScreenLinesUC + loff,
+                                       screen_Columns * sizeof(u8char_T));
+                               for (k = 0; k < MAX_MCO; ++k)
+                                   if (pum_bg_linesC[k] != NULL
+                                                   && ScreenLinesC[k] != NULL)
+                                       mch_memmove(pum_bg_linesC[k] + soff,
+                                               ScreenLinesC[k] + loff,
+                                               screen_Columns
+                                                   * sizeof(u8char_T));
+                           }
+                       }
+                   }
+               }
+           }
+       }
+       else
+       {
+           // Do not redraw in pum_may_redraw() and don't draw in the area
+           // where the popup menu will be.
+           pum_will_redraw = TRUE;
+           update_screen(0);
+           pum_will_redraw = FALSE;
+       }
     }
 
     // never display more than we have
@@ -950,12 +1079,18 @@ pum_redraw(void)
     screen_zindex = POPUPMENU_ZINDEX;
 #endif
 
-    // Draw border and shadow first if enabled
+    // Draw border and shadow first if enabled, before setting blend
+    // so that border/shadow characters are drawn without opacity.
     if (pum_border)
        pum_draw_border();
     if (pum_shadow)
        pum_draw_shadow();
 
+    // Set blend for screen_puts_len / screen_fill to use.
+    // Only the pum content area should be blended, not border/shadow.
+    if (opacity_active)
+       screen_pum_blend = 100 - (int)p_po;
+
     for (i = 0; i < pum_height; ++i)
     {
        idx = i + pum_first;
@@ -967,7 +1102,8 @@ pum_redraw(void)
 #ifdef FEAT_RIGHTLEFT
        if (pum_rl)
        {
-           if (pum_col < curwin->w_wincol + curwin->w_width - 1 - pum_border)
+           if (pum_col < curwin->w_wincol + curwin->w_width - 1
+                                                           - pum_border)
                screen_putchar(' ', row, pum_col + 1, attr);
        }
        else
@@ -1032,8 +1168,8 @@ pum_redraw(void)
 
 #ifdef FEAT_RIGHTLEFT
        if (pum_rl)
-           screen_fill(row, row + 1, pum_col - pum_width + 1, col + 1, ' ',
-                                                           ' ', orig_attr);
+           screen_fill(row, row + 1, pum_col - pum_width + 1, col + 1,
+                                                           ' ', ' ', 
orig_attr);
        else
 #endif
            screen_fill(row, row + 1, col, pum_col + pum_width, ' ', ' ',
@@ -1043,6 +1179,8 @@ pum_redraw(void)
        ++row;
     }
 
+    screen_pum_blend = 0;
+
 #ifdef FEAT_PROP_POPUP
     screen_zindex = 0;
 #endif
@@ -1427,6 +1565,7 @@ pum_set_selected(int n, int repeat UNUSED)
     void
 pum_undisplay(void)
 {
+    pum_free_bg();
     pum_array = NULL;
     redraw_all_later(UPD_NOT_VALID);
     redraw_tabline = TRUE;
diff --git a/src/proto/highlight.pro b/src/proto/highlight.pro
index 5d9231739..856ce86b3 100644
--- a/src/proto/highlight.pro
+++ b/src/proto/highlight.pro
@@ -21,6 +21,7 @@ int get_gui_attr_idx(int attr, guicolor_T fg, guicolor_T bg);
 void clear_hl_tables(void);
 int hl_combine_attr(int char_attr, int prim_attr);
 int hl_blend_attr(int char_attr, int popup_attr, int blend, int blend_fg);
+int hl_pum_blend_attr(int char_attr, int popup_attr, int blend);
 attrentry_T *syn_gui_attr2entry(int attr);
 int syn_attr2attr(int attr);
 attrentry_T *syn_term_attr2entry(int attr);
diff --git a/src/proto/optionstr.pro b/src/proto/optionstr.pro
index be8b8e97b..cb174e73c 100644
--- a/src/proto/optionstr.pro
+++ b/src/proto/optionstr.pro
@@ -136,6 +136,8 @@ int expand_set_printoptions(optexpand_T *args, int 
*numMatches, char_u ***matche
 char *did_set_renderoptions(optset_T *args);
 char *did_set_rightleftcmd(optset_T *args);
 int expand_set_rightleftcmd(optexpand_T *args, int *numMatches, char_u 
***matches);
+char *did_set_pumopt(optset_T *args);
+int expand_set_pumopt(optexpand_T *args, int *numMatches, char_u ***matches);
 char *did_set_pumborder(optset_T *args);
 int expand_set_pumborder(optexpand_T *args, int *numMatches, char_u 
***matches);
 char *did_set_rulerformat(optset_T *args);
diff --git a/src/proto/popupmenu.pro b/src/proto/popupmenu.pro
index 66316dfab..4afd67812 100644
--- a/src/proto/popupmenu.pro
+++ b/src/proto/popupmenu.pro
@@ -5,6 +5,7 @@ void pum_set_margin(int enable);
 void pum_display(pumitem_T *array, int size, int selected);
 void pum_call_update_screen(void);
 int pum_under_menu(int row, int col, int only_redrawing);
+void pum_opacity_changed(void);
 void pum_redraw(void);
 void pum_position_info_popup(win_T *wp);
 void pum_undisplay(void);
diff --git a/src/screen.c b/src/screen.c
index 3e6fd3f4c..04c1f237a 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -2653,6 +2653,34 @@ screen_fill(
                }
 skip_opacity_fill:
 #endif
+               // For pum opacity: blend pum background with underlying.
+               // Only for space cells; text cells are handled normally.
+               if (screen_pum_blend > 0 && c == ' '
+                       && pum_bg_attrs != NULL
+                       && row >= pum_bg_top && row < pum_bg_bot
+                       && col < pum_bg_cols)
+               {
+                   int soff = (row - pum_bg_top) * pum_bg_cols + col;
+                   int underlying_attr = pum_bg_attrs[soff];
+
+                   // Restore underlying character so text shows through.
+                   ScreenLines[off] = pum_bg_lines[soff];
+                   if (enc_utf8 && pum_bg_linesUC != NULL
+                                               && ScreenLinesUC != NULL)
+                   {
+                       int k;
+                       ScreenLinesUC[off] = pum_bg_linesUC[soff];
+                       for (k = 0; k < MAX_MCO; ++k)
+                           if (pum_bg_linesC[k] != NULL
+                                                   && ScreenLinesC[k] != NULL)
+                               ScreenLinesC[k][off] = pum_bg_linesC[k][soff];
+                   }
+                   // Keep underlying fg, blend bg only.
+                   ScreenAttrs[off] = hl_pum_blend_attr(underlying_attr,
+                                           attr, screen_pum_blend);
+                   screen_char(off, row, col);
+                   goto next_col;
+               }
 #if defined(FEAT_GUI) || defined(UNIX)
                // The bold trick may make a single row of pixels appear in
                // the next character.  When a bold character is removed, the
@@ -2699,9 +2727,7 @@ skip_opacity_fill:
                if (!did_delete || c != ' ')
                    screen_char(off, row, col);
            }
-#ifdef FEAT_PROP_POPUP
 next_col:
-#endif
            ScreenCols[off] = -1;
            ++off;
            if (col == start_col)
diff --git a/src/testdir/dumps/Test_pumopt_opacity_100.dump 
b/src/testdir/dumps/Test_pumopt_opacity_100.dump
new file mode 100644
index 000000000..d9e44da0f
--- /dev/null
+++ b/src/testdir/dumps/Test_pumopt_opacity_100.dump
@@ -0,0 +1,20 @@
+|h+0&#ffffff0|e|l@1|o| |w|o|r|l|d| @63
+|h|e|l@1|o| |v|i|m| @65
+|h|e|l@1|o| |o|p|a|c|i|t|y| @61
+|h|e|l|p| |m|e| @67
+|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G
+|R|O|U|N|D| @69
+|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G
+|R|O|U|N|D| @69
+|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G
+|R|O|U|N|D| @69
+|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G
+|R|O|U|N|D| @69
+|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G
+|R|O|U|N|D| @69
+|h|e|l@1|o> @69
+|h+0#0000001#e0e0e08|e|l@1|o| @9| +0#4040ff13#ffffff0@59
+|h+0#0000001#ffd7ff255|e|l|p| @10| +0#4040ff13#ffffff0@59
+|~| @73
+|~| @73
+|-+2#0000000&@1| |K|e|y|w|o|r|d| |c|o|m|p|l|e|t|i|o|n| |(|^|N|^|P|)| 
|m+0#00e0003&|a|t|c|h| |1| |o|f| |2| +0#0000000&@33
diff --git a/src/testdir/dumps/Test_pumopt_opacity_50.dump 
b/src/testdir/dumps/Test_pumopt_opacity_50.dump
new file mode 100644
index 000000000..d9e44da0f
--- /dev/null
+++ b/src/testdir/dumps/Test_pumopt_opacity_50.dump
@@ -0,0 +1,20 @@
+|h+0&#ffffff0|e|l@1|o| |w|o|r|l|d| @63
+|h|e|l@1|o| |v|i|m| @65
+|h|e|l@1|o| |o|p|a|c|i|t|y| @61
+|h|e|l|p| |m|e| @67
+|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G
+|R|O|U|N|D| @69
+|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G
+|R|O|U|N|D| @69
+|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G
+|R|O|U|N|D| @69
+|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G
+|R|O|U|N|D| @69
+|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G|R|O|U|N|D|B|A|C|K|G
+|R|O|U|N|D| @69
+|h|e|l@1|o> @69
+|h+0#0000001#e0e0e08|e|l@1|o| @9| +0#4040ff13#ffffff0@59
+|h+0#0000001#ffd7ff255|e|l|p| @10| +0#4040ff13#ffffff0@59
+|~| @73
+|~| @73
+|-+2#0000000&@1| |K|e|y|w|o|r|d| |c|o|m|p|l|e|t|i|o|n| |(|^|N|^|P|)| 
|m+0#00e0003&|a|t|c|h| |1| |o|f| |2| +0#0000000&@33
diff --git a/src/testdir/test_popup.vim b/src/testdir/test_popup.vim
index bf400d18f..0ea6ae48e 100644
--- a/src/testdir/test_popup.vim
+++ b/src/testdir/test_popup.vim
@@ -2420,4 +2420,50 @@ func Test_popup_shadow_hiddenchar()
   call StopVimInTerminal(buf)
 endfunc
 
+" Test pumopt opacity with screendump: background text should show through
+func Test_pumopt_opacity_screendump()
+  CheckScreendump
+  let lines =<< trim END
+    set pumopt=opacity:50
+    set completeopt=menu
+    call setline(1, ['hello world', 'hello vim', 'hello opacity', 'help me'])
+    for i in range(5)
+      call append(line('$'), repeat('BACKGROUND', 8))
+    endfor
+    normal gg
+  END
+  call writefile(lines, 'Xpumoptopacity', 'D')
+  let buf = RunVimInTerminal('-S Xpumoptopacity', {})
+  call TermWait(buf)
+  call term_sendkeys(buf, "Gohel\<C-N>")
+  call TermWait(buf, 100)
+  call VerifyScreenDump(buf, 'Test_pumopt_opacity_50', {})
+  call term_sendkeys(buf, "\<C-E>\<Esc>u")
+  call TermWait(buf)
+  call StopVimInTerminal(buf)
+endfunc
+
+" Test pumopt opacity:100 (fully opaque, same as default)
+func Test_pumopt_opacity_100()
+  CheckScreendump
+  let lines =<< trim END
+    set pumopt=opacity:100
+    set completeopt=menu
+    call setline(1, ['hello world', 'hello vim', 'hello opacity', 'help me'])
+    for i in range(5)
+      call append(line('$'), repeat('BACKGROUND', 8))
+    endfor
+    normal gg
+  END
+  call writefile(lines, 'Xpumoptopacity100', 'D')
+  let buf = RunVimInTerminal('-S Xpumoptopacity100', {})
+  call TermWait(buf)
+  call term_sendkeys(buf, "Gohel\<C-N>")
+  call TermWait(buf, 100)
+  call VerifyScreenDump(buf, 'Test_pumopt_opacity_100', {})
+  call term_sendkeys(buf, "\<C-E>\<Esc>u")
+  call TermWait(buf)
+  call StopVimInTerminal(buf)
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/testdir/util/gen_opt_test.vim 
b/src/testdir/util/gen_opt_test.vim
index 72ff49b62..6a02c531b 100644
--- a/src/testdir/util/gen_opt_test.vim
+++ b/src/testdir/util/gen_opt_test.vim
@@ -291,6 +291,11 @@ let test_values = {
       \                'double,margin,shadow', 'custom:─;│;─;│;┌;┐;┘;└,shadow',
       \                'ascii,margin'],
       \                ['xxx', 'margin', 'margin,shadow', 'custom:', 
'custom:+;']],
+      \ 'pumopt': [['', 'border:single', 'border:double', 'border:ascii',
+      \                'height:10', 'width:20', 'maxwidth:30', 'opacity:50',
+      \                'border:double,margin,shadow',
+      \                'height:10,width:20,maxwidth:30,opacity:80'],
+      \                ['xxx', 'opacity:200', 'opacity:-1', 'margin']],
       \ 'renderoptions': [[''], ['xxx']],
       \ 'rightleftcmd': [['search'], ['xxx']],
       \ 'rulerformat': [['', 'xxx'], ['%-', '%(', '%15(%%']],
diff --git a/src/version.c b/src/version.c
index f86607789..37aed30c3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    318,
 /**/
     317,
 /**/

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