Add colors to diff

Highlighting in diff files is essential.  This minimal solution uses
vimdiff highlighting groups.  So it will be messy to compare two diffs.
But it's pretty rare case.

1 files changed, 3 insertions, 0 deletions

diff --git a/colors/off.vim b/colors/off.vim
index 8af12e3..142bbb5 100644
--- a/colors/off.vim
+++ b/colors/off.vim
@@ -189,6 +189,9 @@ call s:h("htmlH4",        {"bg": s:bg, "fg": s:norm})
 call s:h("htmlH5",        {"bg": s:bg, "fg": s:norm})
 call s:h("htmlH6",        {"bg": s:bg, "fg": s:norm})
 
+hi link diffRemoved       DiffDelete
+hi link diffAdded         DiffAdd
+
 " Signify, git-gutter
 hi link SignifySignAdd              LineNr
 hi link SignifySignDelete           LineNr