Ubuntu
mutter package

  1. Bug #1751593
  2. Comment #18

Comment 18 for bug 1751593

Revision history for this message
In , Michael Thayer (michael-thayer) wrote :

Pointed to this bug by Jonas Ådahl on the GNOME Shell mailing list.

We seem to see something similar when starting VirtualBox. In VirtualBox we need for various reasons to know what the usable area of each screen is - that translates as the largest rectangle which fits on that screen without obscuring any panels or similar. We find that out by mapping a maximised window on each screen at start-up and checking its position and dimensions. To prevent disturbance to the user we create the window fully translucent, or if the X server does not support that we use XShape and leave only a single pixel visible. On GNOME Shell Wayland edition (what is the right way to say that?) this unfortunately flashes a black rectangle up on the screen in the area which should be translucent.

(If anyone is interested I explained the why of this on the mailing list[1].) I see this on Ubuntu 17.04 and 18.04 Wayland session, and it has been reported on Fedora too. Please let me know if I should test any patch, including previous ones on this bug.

[1] https://mail.gnome.org/archives/gnome-shell-list/2018-February/msg00001.html