In the Vim documentation, diff.txt says
==
In your .vimrc file you could do something special when Vim was started in
diff mode. You could use a construct like this:
if &diff
setup for diff mode
else
setup for non-diff mode
endif
While already in Vim you can start diff mode in three ways...
==
Therefore the above check in .vimrc is unsufficient to capture the three other
ways to enter diff mode in Vim. All of these set the options like for "vimdiff".
How about an autocmd for this event when the options like for "vimdiff" are set?
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