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bug#24585: 25.1; avoid hack in ggtags.el to run compilation-auto-jump ti

From: Stefan Monnier
Subject: bug#24585: 25.1; avoid hack in ggtags.el to run compilation-auto-jump timer
Date: Fri, 07 Oct 2016 14:10:53 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

>> Not sure what you mean by "fired", but in any case, no: font-lock is not
>> used for that (tho it has been used at some point before
>> compilation-auto-jump was introduced, IIRC).  Instead, it's done via
>> syntax-propertize (which can be triggered in all kinds of ways,
>> including font-lock).
> This
> (defun compilation-mode-font-lock-keywords ()
>   "Return expressions to highlight in Compilation mode."
>   (append
>    '((compilation--ensure-parse))
>    compilation-mode-font-lock-keywords))
> and the only place in compile.el that mentions syntax-propertize is in a
> comment.

Duh!  Indeed, sorry, I mis-remembered.  Indeed, after first (ab)using
syntax-propertize I changed it to use the same approach but without
using syntax-propertize.

The point is the same, tho: the parse can be triggered by other things
than font-lock.  That's important because font-lock may be turned off.

>> How 'bout something like the following:
>> - Add a new var compilation-pending-auto-jump set buffer-locally to
>> non-nil when compilation-error-properties calls run-with-timer.
>> - in compilation-auto-jump, check this var before doing anything and set
>> it back to nil.
>> - in ggtags, call compilation-auto-jump to make sure this timer is run
>> before yours.
> I think the issue is compilation-error-properties can happen after
> compilation-finish-functions. And calling compilation--ensure-parse in
> ggtags-global-handle-exit doesn't seem to help.

Hmm... calling compilation--ensure-parse *should* help.
More specifically, if you call compilation--ensure-parse up to point-max
from compilation-finish-functions, I can't think of any reason why
compilation-error-properties should be called afterwards.  If you can
get a backtrace of when that happens, it would help.

E.g. set a buffer-local var from compilation-finish-functions after
calling compilation--ensure-parse, and then add an assert in
compilation-error-properties to check that that var is not set yes.


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