bug#19266: 24.4; Font-related window redrawing delays on OS X

[Kirill Ignatiev <kirill.ignatiev@gmail.com>]

On 11 December 2014 at 12:45, Eli Zaretskii <eliz@gnu.org> wrote:
>> Date: Wed, 10 Dec 2014 18:50:01 -0500
>> From: Kirill Ignatiev <kirill.ignatiev@gmail.com>
>> Cc: Sebastian Wiesner <swiesner@lunaryorn.com>, 19266@debbugs.gnu.org
>
> Comment out the call to cleanup_vector?

Oops, I only tried to turn compact_font_cache_entry into a noop. But
neither that, nor doing nothing in cleanup_vector works. If I comment
out drv->close, I see a bunch of calls to drv->close not being made,
but new fonts are *still* being opened in font_open_entity.

I'm guessing that when fonts are garbage collected, they are already
genuinely discarded, not pointed to from elisp structures (or where
they are stored), and are genuine garbage. Do you know where the
pointers to fonts live? I haven't figured out where they are being
discarded, and I'd like to stop them from becoming garbage in the
first place.

>
>> How do I trigger font garbage collection manually?
>
> Did you try "M-x garbage-collect RET"?

Yes, but it doesn't seem to trigger closing fonts. Perhaps there is
some other process at work there?

Thanks for your help, these redrawing delays are really irritating.