Hi all,

I am facing an issue with gvim.

I use archlinux + awesome tiling WM. The bug is not 100% reproducible but it 
does happen most of the time (e.g. 90%). The steps to reproduce are:

1. Open gvim in full screen mode.
2. Create two buffers
3. Move to a different workspace (e.g. on the browswer)
4. return to the gvim workspace
5. bump! You get a grey screen and you need to :redraw in order to see the 
buffers. Here is a screenshot: http://i.imgur.com/b6jyEWI.png

If there is just a single buffer then there is no issue at all. In normal vim 
this does not happen. This is not related to plugins because I can also 
reproduce it with:

    gvim -N -U NONE 

I think that I remember that I first noticed it when I upgraded to awesome v4 
(i.e. a month ago?). But that might just be a coinsidence. 

I also believe this is the same issues as the one described on debian's bug 
tracker, so I am not the only one facing it: 
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=856920

best regards,
Panos

```
$ gvim --version
VIM - Vi IMproved 8.0 (2016 Sep 12, compiled Feb  6 2017 16:10:01)
Included patches: 1-314
Compiled by Arch Linux
Huge version with GTK2 GUI.  Features included (+) or not (-):
+acl             +file_in_path    +mouse_sgr       +tag_old_static
+arabic          +find_in_path    -mouse_sysmouse  -tag_any_white
+autocmd         +float           +mouse_urxvt     +tcl/dyn
+balloon_eval    +folding         +mouse_xterm     +termguicolors
+browse          -footer          +multi_byte      +terminfo
++builtin_terms  +fork()          +multi_lang      +termresponse
+byte_offset     +gettext         -mzscheme        +textobjects
+channel         -hangul_input    +netbeans_intg   +timers
+cindent         +iconv           +num64           +title
+clientserver    +insert_expand   +packages        +toolbar
+clipboard       +job             +path_extra      +user_commands
+cmdline_compl   +jumplist        +perl/dyn        +vertsplit
+cmdline_hist    +keymap          +persistent_undo +virtualedit
+cmdline_info    +lambda          +postscript      +visual
+comments        +langmap         +printer         +visualextra
+conceal         +libcall         +profile         +viminfo
+cryptv          +linebreak       +python/dyn      +vreplace
+cscope          +lispindent      +python3/dyn     +wildignore
+cursorbind      +listcmds        +quickfix        +wildmenu
+cursorshape     +localmap        +reltime         +windows
+dialog_con_gui  +lua/dyn         +rightleft       +writebackup
+diff            +menu            +ruby/dyn        +X11
+digraphs        +mksession       +scrollbind      -xfontset
+dnd             +modify_fname    +signs           +xim
-ebcdic          +mouse           +smartindent     -xpm
+emacs_tags      +mouseshape      +startuptime     +xsmp_interact
+eval            +mouse_dec       +statusline      +xterm_clipboard
+ex_extra        +mouse_gpm       -sun_workshop    -xterm_save
+extra_search    -mouse_jsbterm   +syntax          
+farsi           +mouse_netterm   +tag_binary      
   system vimrc file: "/etc/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
      user exrc file: "$HOME/.exrc"
  system gvimrc file: "/etc/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-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/pango-1.0 
-I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 
-I/usr/include/libdrm -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 
-I/usr/include/pango-1.0 -I/usr/include/freetype2 -I/usr/include/libpng16 
-I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include 
-I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz 
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -D_FORTIFY_SOURCE=2  
-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong 
-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1       
Linking: gcc   -L. -Wl,-O1,--sort-common,--as-needed,-z,relro -fstack-protector 
-rdynamic -Wl,-export-dynamic -Wl,-E -Wl,-rpath,/usr/lib/perl5/core_perl/CORE  
-Wl,-O1,--sort-common,--as-needed,-z,relro -L/usr/local/lib -Wl,--as-needed -o 
vim   -lgtk-x11-2.0 -lgdk-x11-2.0 -lpangocairo-1.0 -latk-1.0 -lcairo 
-lgdk_pixbuf-2.0 -lgio-2.0 -lpangoft2-1.0 -lpango-1.0 -lgobject-2.0 -lglib-2.0 
-lfontconfig -lfreetype -lSM -lICE -lXt -lX11 -lXdmcp -lSM -lICE  -lm -lncurses 
-lelf -lnsl    -lacl -lattr -lgpm -ldl   -Wl,-E 
-Wl,-rpath,/usr/lib/perl5/core_perl/CORE 
-Wl,-O1,--sort-common,--as-needed,-z,relro -fstack-protector-strong 
-L/usr/local/lib  -L/usr/lib/perl5/core_perl/CORE -lperl -lpthread -lnsl -ldl 
-lm -lcrypt -lutil -lc   -L/usr/lib -ltclstub8.6 -ldl -lz -lpthread -lieee -lm  
   
```

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