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bug#36564: 27.0.50; Wrong number of errors in compilation mode-line

From: Juri Linkov
Subject: bug#36564: 27.0.50; Wrong number of errors in compilation mode-line
Date: Sun, 14 Jul 2019 01:04:25 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu)

>> I tried compilation--ensure-parse, and it updates the number of errors,
>> so I replaced font-lock-ensure with compilation--ensure-parse.
> Thanks, that's much better.
> I'm still worried about the performance cost of running
> compilation--ensure-parse every time we get a few chars from the
> process filter.
> Not sure how/where to delay it, tho.  Maybe some idle timer?

IIUC, after adding compilation--ensure-parse there is no
performance degradation in case when the compilation buffer
is displayed during compilation, because compilation--ensure-parse
is called on the same-sized chunks as when the buffer is fontified
by font-lock.

I noticed this when tried to debug the problem of fontifying
diff hunks, but I failed to find a solution.  The problem is this:
sometimes diff-mode doesn't refine some hunks during font-lock
when the first part of the hunk emitted by diff-process-filter
(from the diff command comparing files) is fontified partly,
then after emitting the remaining part of the hunk it remains

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