patch 8.2.2880: unified diff fails if actually used Commit: https://github.com/vim/vim/commit/ad5c178a191cf2cf37a27c2a789d7afda3879831 Author: glacambre <code@lacamb.re> Date: Mon May 24 14:20:53 2021 +0200 patch 8.2.2880: unified diff fails if actually used Problem: Unified diff fails if actually used. Solution: Invoke :diffupdate in the test. Fix the check for working external diff. (Ghjuvan Lacambre, Christian Brabandt, closes #8197)

" gvimrc for test_gui_init.vim

if has('gui_athena') || has('gui_motif') || has('gui_gtk2') || has('gui_gtk3')
  set guiheadroom=0
  set guioptions+=p
endif