Stored screen buffer is displayed when Firefox is minimized

Submitted by Aaron Hancock

Assigned to Olivier Fourdan @olivier

Description

Created attachment 6872 Screenshot of bug in action. Parts of Konsole and Thunderbird have redrawn.

Hello.

I've had this issue for quite a while now. Every so often (I've managed to track it down to when I minimize Firefox) the contents of my screen will be overwritten with something that was on my screen before. When things redraw, they'll redraw over this restored buffer, but usually it'll quickly revert to the bad buffer.

Typically this buffer is just the Xscreensaver lock screen, but sometimes it's something I was working on any time from a few minutes ago to a few hours ago. It's all very random and sporadic, from the contents of this buffer to when it appears and how frequently it redraws. (For instance, sometimes it reverts to the bad buffer after about 30 seconds, but other times it reverts almost instantly, making the computer almost unusable.) In the screenshot, despite triggering this bug at ~7:19 PM, the screenshot shows an Xscreensaver time of 6:10 PM.

I am running xfwm 4.12.2 on OpenSUSE Tumbleweed (Linux linux-3mc6 4.7.5-1-default #1 (closed) SMP PREEMPT Mon Sep 26 08:11:45 UTC 2016 (02c4d35) x86_64 x86_64 x86_64 GNU/Linux) using the nouveau drivers with a Nvidia Quadro 2800M (NV92). This issue does not occur with KDE Plasma 5.x or icewm.

Attachment 6872, "Screenshot of bug in action. Parts of Konsole and Thunderbird have redrawn.":

Version: 4.12.0