I've just solved a packaging issue on the machine, and Apt has pulled down 
Vim 8.2.1897, with the same issue. Console output below:

philpem@cheetah:~$ gvim --version
VIM - Vi IMproved 8.2 (2019 Dec 12, compiled Oct 24 2020 16:26:37)
Included patches: 1-1897
Modified by jonathon.fernyho...@york.ac.uk
Compiled by jonathon.fernyho...@york.ac.uk
Huge version with GTK3 GUI. Features included (+) or not (-):
+acl -farsi +mouse_sgr +tag_binary
+arabic +file_in_path -mouse_sysmouse -tag_old_static
+autocmd +find_in_path +mouse_urxvt -tag_any_white
+autochdir +float +mouse_xterm +tcl
-autoservername +folding +multi_byte +termguicolors
+balloon_eval -footer +multi_lang +terminal
+balloon_eval_term +fork() -mzscheme +terminfo
+browse +gettext +netbeans_intg +termresponse
++builtin_terms -hangul_input +num64 +textobjects
+byte_offset +iconv +packages +textprop
+channel +insert_expand +path_extra +timers
+cindent +ipv6 +perl +title
+clientserver +job +persistent_undo +toolbar
+clipboard +jumplist +popupwin +user_commands
+cmdline_compl +keymap +postscript +vartabs
+cmdline_hist +lambda +printer +vertsplit
+cmdline_info +langmap +profile +virtualedit
+comments +libcall -python +visual
+conceal +linebreak +python3 +visualextra
+cryptv +lispindent +quickfix +viminfo
+cscope +listcmds +reltime +vreplace
+cursorbind +localmap +rightleft +wildignore
+cursorshape +lua +ruby +wildmenu
+dialog_con_gui +menu +scrollbind +windows
+diff +mksession +signs +writebackup
+digraphs +modify_fname +smartindent +X11
+dnd +mouse +sound -xfontset
-ebcdic +mouseshape +spell +xim
+emacs_tags +mouse_dec +startuptime +xpm
+eval +mouse_gpm +statusline +xsmp_interact
+ex_extra -mouse_jsbterm -sun_workshop +xterm_clipboard
+extra_search +mouse_netterm +syntax -xterm_save
system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
2nd user vimrc file: "~/.vim/vimrc"
user exrc file: "$HOME/.exrc"
system gvimrc file: "$VIM/gvimrc"
user gvimrc file: "$HOME/.gvimrc"
2nd user gvimrc file: "~/.vim/gvimrc"
defaults file: "$VIMRUNTIME/defaults.vim"
system menu file: "$VIMRUNTIME/menu.vim"
fall-back for $VIM: "/usr/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK -pthread 
-I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 
-I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 
-I/usr/lib/x86_64-linux-gnu/dbus-1.0/include -I/usr/include/gtk-3.0 
-I/usr/include/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/pango-1.0 
-I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 
-I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/freetype2 
-I/usr/include/libpng16 -I/usr/include/freetype2 -I/usr/include/libpng16 
-I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 
-I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include 
-Wdate-time -g -O2 -fdebug-prefix-map=/build/vim-KZNIhZ/vim-8.2.1897=. 
-fstack-protector-strong -Wformat -Werror=format-security -D_REENTRANT 
-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 
Linking: gcc -L. -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now 
-fstack-protector -rdynamic -Wl,-export-dynamic -Wl,-E 
-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -o vim 
-lgtk-3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0 -latk-1.0 -lcairo-gobject 
-lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0 -lSM -lICE 
-lXpm -lXt -lX11 -lXdmcp -lSM -lICE -lm -ltinfo -lselinux -lcanberra -lacl 
-lattr -lgpm -ldl -L/usr/lib -llua5.2 -Wl,-E -fstack-protector-strong 
-L/usr/local/lib -L/usr/lib/x86_64-linux-gnu/perl/5.26/CORE -lperl -ldl -lm 
-lpthread -lcrypt -L/usr/lib/python3.6/config-3.6m-x86_64-linux-gnu 
-lpython3.6m -lpthread -ldl -lutil -lm -L/usr/lib/x86_64-linux-gnu -ltcl8.6 
-ldl -lz -lpthread -lm -lruby-2.5 -lpthread -lgmp -ldl -lcrypt -lm 

philpem@cheetah:~$ gvim
 [>4;m [>4;2mphilpem@cheetah:~$ gvim
 [>4;m [>4;2mphilpem@cheetah:~$ 

Thanks
Phil.

On Wednesday, 6 January 2021 at 21:55:25 UTC john.b...@gmail.com wrote:

> - Ubuntu 18.04 with your Vim 8.1 -- has the issue
>>
>
> I wonder why you need Vim 8.1.  At  
> https://launchpad.net/~jonathonf/+archive/ubuntu/vim I see only vim 8.2 
> for 18.04.  
>
> Regards, John Little
>

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