So I have
diff.indentHeuristic = true
and I noticed that git-gui was not using the heuristic. This is because
git-gui uses diff-index, and that does not respect the config setting,
even though it supports the --indent-heuristic option.
And it looks like diff-files and diff-tree also have the same problem.
I tried a couple of quick-n-dirty things to fix it in diff-index,
without success, and I've run out of git-hacking tame, so all I can do
for now is throw out a bug report.
diff-index.c explicitly says "no 'diff' UI options" since 83ad63cfeb
("diff: do not use configuration magic at the core-level", 2006-07-08),
so maybe this needs to be fixed in git-gui (and maybe elsewhere), but to
me it feels like the diff-foo commands should respect the setting.
(CC'ing Michael Haggerty, who added the heuristic.)
(This is git v2.12.2.)
M.