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Subject: |
shrinking windows with gtk 3.20 |
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Date: |
Mon, 28 Mar 2016 16:52:47 -0400 |
We've observed that after
https://git.gnome.org/browse/gtk+/commit/?id=67ab00e01ec06d7b05a82c3d80b235ac6c4abfd2
emacs windows shrink to a small height, after initially appearing with
the expected size. For that reason, I have reverted to commit in the
stable gtk 3.20 branch.
But after looking a bit closer, I find that what emacs does is really
unsupportable: It handles X events behind GTK+'s back, and upon seeing
a map notify, it calls xg_frame_resized with -1, -1 for width and
height, which makes it call gdk_window_get_geometry to obtain the
current size. But at that point (before GTK+ has handled the map
notify), the function still returns the initial values of 1, 1, which
then leads eventually to a call of gtk_window_resize() with the small
height that we're seeing the window shrink to.
Therefore, I will bring back the reverted change in GTK+ master.
Possible workarounds/fixes in the emacs code:
1) Recognize when gdk_window_get_geometry returns the initial size
(1,1) and silently return as if the window was unmapped.
2) Just drop the xg_frame_resized call on MapNotify. Omitting it
doesn't have any noticeable negative consequences.
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--- Begin Message ---
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Subject: |
Re: shrinking windows with gtk 3.20 |
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Date: |
Mon, 16 May 2016 10:11:48 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.0 |
On 05/16/2016 08:53 AM, Eli Zaretskii wrote:
we could reject GTK+ 3.20.4 and later for Emacs 25.1 at configure
time.
On further investigation of the Gtk+ source, it appears that the Gtk+
change went in at release 3.20.3. Since it seems clear that Emacs has
serious problems in 3.20.3 or later because of the call to
xg_frame_resized, I installed the attached patch and am boldly closing
the bug report. Quite possibly there is a better way to fix the bug but
I hope this is good enough to get by.
0001-Avoid-shrinking-windows-with-Gtk-3.20.3.patch
Description: Source code patch
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