I've found a recent bug report for this issue on the GitLab site for mutter:
https://gitlab.gnome.org/GNOME/mutter/issues/140
This also requires me to correct my initial bug report. The issue is
unrelated to client-side decorated windows, but affects all native
Wayland windows, while XWayland
** Project changed: gtk => mutter
** Summary changed:
- Restoring edge tiled windows with client-side decorations shrinks them
(Wayland)
+ Restoring edge tiled windows on Wayland shrinks them
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** Also affects: gtk
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1768734
Title:
Restoring edge tiled windows with client-side
The bug shows up only in a Wayland session. The behaviour is normal
under Xorg. Quite possibly an issue with GTK+, which is improperly
handling the sizing of client-side decorated windows when
tiling/untiling them.
** Summary changed:
- restoring edge tiled windows with client-side decorations
** Attachment added: "Short screencast illustrating the bug"
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1768734/+attachment/5133679/+files/edge_tiling_bug.webm
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Public bug reported:
I'm running Ubuntu 18.04 with a vanilla GNOME session under Wayland (the
issue presents with the default Ubuntu session too). I've encountered
this issue with applications that use Client-Side window decorations,
which is most of the GNOME applications. Windows with borders
The dash to panel extension is not present on my system (Ubuntu GNOME),
so the bug is surely not specific to that, as seen in the linked GNOME
Bugzilla report.
Here are lines from my syslog from various crashes (not adding any extra
debug information, which has been provided in previous
Reading the report at https://bugs.launchpad.net/ubuntu/+source/gnome-
panel/+bug/17787 might give a clue to the source of the problem. The
real culprit seems to be the transparency of the panel. The panel with
the wnck-applet needs to have both auto-hide and transparency enabled
for the memory
