Created attachment 7885 terminal output Hello, I'm testing Xubuntu 18.10 with xfwm4 4.13.1 installed in VirtualBox VM. I have an issue with xfwm4-settings (opened separately and within the xfce4-settings-manager) window crashing when I change the button layout, just by dragging it's elements. There are some issues with "gtk_widget_size_allocate" and most important: xfwm4-settings: ../../../../src/cairo-surface.c:1734: cairo_surface_mark_dirty_rectangle: Assertion `! _cairo_surface_has_mime_data (surface)' failed. (full terminal output attached) Besides the window closing/crashing, when I open Window Manager settings from Settings Manager (and only then) and when I change the button layout, the buttons are disappearing from that section (see here - https://ibb.co/mXtPBU ). Probably related to "gtk_widget_size_allocate".
Also, this is my Launchpad bug report related to this issue, maybe it will be useful: https://bugs.launchpad.net/ubuntu/+source/xfce4-settings/+bug/1785143
I'm on Xubuntu 19.04 Disco Dingo now and I still have this issue with Window Manager settings window. It doesn't always crash, but the issue with disappearing buttons when changing the layout is all the time, easy to reproduce. xfwm4 4.13.1-3~19.04, VirtualBox VM Bug reports from Launchpad related to this issue: https://bugs.launchpad.net/ubuntu/+source/xfwm4/+bug/1821638 https://bugs.launchpad.net/ubuntu/+source/xfwm4/+bug/1821517
Olivier Fourdan referenced this bugreport in commit 60a8e49c8a63db47b8eb31618e0b6aa5be729a80 settings: Crash in button layout https://git.xfce.org/xfce/xfwm4/commit?id=60a8e49c8a63db47b8eb31618e0b6aa5be729a80