Different workspace image randomly flashes on current workspace when compositor is on
Submitted by BSR
Assigned to Olivier Fourdan @olivier
Description
I'm running xfce4 4.12.4 on Ubuntu Bionic with six workspaces in 3x2 layout. When working on workspace 2, sometimes, at random, and not seemingly triggered by anything obvious, the image of what's on workspace 1 will appear. The applications running on workspace 2 are still there, its just the bitmap image from workspace 1 has been overlaid. As the applications refresh themselves if I click or mouse around they will restore, and pretty quickly the workspace looks ok again when everything has repainted.
It doesn't happen with multiple workspace systems under Gnome - I've only seen it with XFCE.
I did look for errors in ~/.Xsession-errors but xfce4 doesn't seem to be writing an xsession-errors file - at least I can't find it. I might not be looking in the right place.
XFCE has all the features I want in a desktop without the weight of Gnome which this PC struggles with. Would be nice to fix. Can post system details - its a Dell desktop with two differently-sized monitors connected, if that's relevant...
Version: 4.12.0