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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