When I diff a syntax-highlighted buffer, the diff highlighting often
conflicts with the syntax highlighting so that some text has the
same foreground and background colors and becomes impossible to
read.

I have worked around this problem with the following autocommand.

    au FilterWritePost * if &diff | setlocal syn=OFF | endif

With the new internal diff, this doesn't seem to be working anymore.
That makes sense since the internal diff doesn't need to write any
files, but now we don't seem to have a hook for changing settings
when diff is enabled.

What would be nicest is a pair of hooks (autocommand events) that
would be triggered when a buffer entered and left diff mode.

Any thoughts on this?

Regards,
Gary

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