The `gdk_x11_display_error_trap_push` symbol in the above stack trace indicates it's the upstream bug described in the following issue, and fixed by the patch in the referenced comment:
https://gitlab.xfce.org/xfce/xfwm4/-/issues/351#note_13692
The problem is confirmed present in the current Focal package source, xfwm4 v. 4.14.1.
The `gdk_x11_ display_ error_trap_ push` symbol in the above stack trace indicates it's the upstream bug described in the following issue, and fixed by the patch in the referenced comment:
https:/ /gitlab. xfce.org/ xfce/xfwm4/ -/issues/ 351#note_ 13692
The problem is confirmed present in the current Focal package source, xfwm4 v. 4.14.1.