When moving firefox from display to display, chunks of it remain in other displays flickering

[luispabon]

• Sway Version: sway version 1.6-rc2-1d62d6bf (Mar 29 2021, branch 'master')

• Debug Log: https://paste.ubuntu.com/p/R57NYtJJ4n/

• Configuration File: https://github.com/luispabon/sway-dotfiles/tree/master/configs/sway

• Stack Trace: n/a

• Description:

• Log into sway
• Start firefox
• Make window floating
• Move from display to display
• You can see fragments of firefox being displayed on the wrong display, flickering constantly

This recording is the same session as the debug log above:
https://www.youtube.com/watch?v=0cb8-hJFF9w

Seems to be related to firefox re-flowing itself after changing scale. Clicking on the flickering area clears it.

[luispabon]

This also happens with a non-floated main Firefox window and a floated (automatically via rules in sway's config) Picture in Picture video.

The glitch does not update with the video, ie, it's always the same frame.

[emersion]

This is a damage tracking issue.

[markstos]

I cannot reproduce this on Sway 1.5.1 with both an internal and external monitor set to scale 1.

[luispabon]

It feels like this happens when the firefox window is re-scaled - for a split second when moving from display to display with different scales, the window quadruples in size (when moving from scale 2 to 1) and parts of the window suddenly appear on other displays. Those chunks of the window remaining there while flickering are basically it.

[markstos]

I cannot reproduce this on Sway 1.5.1 with internal monitor set to scale 1 and external monitor set to scale "2". Seemed fine moving in either direction. So either I'm testing a different case or this is a regression.

[luispabon]

Not a regression, this has been happening for at least a year or so, I've only just gotten around to report it.

[savchenko]

Sway v1.5, Debian Bullseye: there is momentarily, very short and single event of flicker when moving FF from one screen to another when one of the screens has different DPI.

I don't see any "leftovers" after moving the window and suspect that flicker happens when FF is switching to a different DPI.

[b0o]

I've been experiencing this for many months as well. It happens almost every time I move Firefox from my main display (scale = 1.2) to my farthest left display (scale = 1). Oddly, it doesn't seem to happen as much when I move FF from my main display to my farthest right display (scale = 1). I've also seen it happen with alacritty but it's less common.

[jivvy]

I have also been experiencing this for maybe a year or two. It's the only pain point I have with sway

In order to remove the flashing, I select the screen with flickering, then go back to what I was doing. It clears the flickering away.

It happens with not just firefox, but many applications including Godot, Logseq, Bevy projects. It usually happens when I make a window into a floating window on one screen, it seems like the window briefly is drawn on other screens, then shrinks to the proper size, but leaves ghosts behind.

Sway 1.8.1-1

[luispabon]

This is still happening to me. Same sway version. Only on firefox though, I don't use any of the other apps @jivvy mentioned above.

[vyivel]

Should be closed by #6844.

[luispabon]

🤞🏽 thank you, I'll test & report back once I can get wlroots master to compile on ubuntu 23.10