bug#15801: 24.3.50; bar scrolling freezes gtk emacs

[Jan Djärv]

Hello.

5 dec 2013 kl. 18:08 skrev Jarek Czekalski <jarekczek@poczta.onet.pl>:

> I founded a way to freeze Emacs without using any syntax, that could be 
> considered incorrect from the glib/gtk point of view. At least nothing 
> incorrect stays in xgselect.
> 
> This is practically whole xg_select function, that still makes Emacs freeze:
> 
>  context = g_main_context_default ();
>  while (g_main_context_iteration(context, 0)); // 0 = no wait
>  return 1;
> 
> So this makes context_query call free of any charges. I'm sorry for blaming 
> it for the problems. But it's so tempting when you see something 
> theoretically incorrect, to blame it for all the problems.
> 
> I'll try to locate the place in gtk that starts the problem. So far I only 
> know that the commit from gtk 3.7.10 introducing
> motion compression is not yet making it freeze. Although that sounded 
> promising. So I'm starting binary search with gtk 3.7.10 being safe, and 
> 3.8.4 failing. I hope to help with fixing it, because gtk 3.8.4 is going to 
> be used in next stable Debian, jessie, which is currently described as 
> testing.
> 
> Motion compression commit:
> https://git.gnome.org/browse/gtk+/commit/gdk/gdkwindow.c?id=a69285da08a2a61d5fd817ee8ccb88a6b6deaef6
> 
> If someone is still listening, please help me gather statistics about this 
> bug. If you have:
> 1. libgtk-3 >=3.7.10
> 2. emacs built with gtk3
> Please report through priv whether you reproduce or not. Tell me even if you 
> don't reproduce and send the output of /proc/cpuinfo. Mine is "Intel Celeron 
> 3.2G". My email: jarekczek # poczta.onet.pl.
> Remember to make sure which gtk is actually used, for example using "strace 
> emacs -Q 2>&1 | grep libgtk"


This whole clock-thing (enable/disable events in Gtk+) is quite new (3.7) , so 
I'd expect there will be bugs.  As I said, I can't reproduce it on Gtk+ 3.8.6.  
Don't know why cpuinfo is relevant, I would suspect graphics driver more.  But 
Gtk+ bugs the most.

        Jan D.

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