Fragments of wayneko sprites all along bottom of the screen after locking and unlocking

[Anomalocaridid]

When using wayneko, under certain circumstances, such as after locking and unlocking the screen, the bottom of the screen gets peppered with random fragments of sprites that do not go away unless wayneko's cat walks over them.

System Information

• niri version: niri stable v25.01 (commit e05bc269e678ecf828b96ae79c991c13b00b38a5)

• Distro: NixOS unstable

• GPU: AMD Radeon RX 580 Series

• CPU: AMD Ryzen 7 3700X

[YaLTeR]

My guess is that wayneko fails to do damage tracking properly when its surface is invisible.

[Anomalocaridid]

I forgot to mention that this does not happen on hyprland, if that helps.

[YaLTeR]

Could you try other compositors? Namely sway and kwin.

[Anomalocaridid]

I have tried it and I could not replicate this in sway or in the wayland version of kwin.

[YaLTeR]

Thanks for testing. Need to look into it to see what's going on

[underscoregeb]

this occurs seemingly at random times on my system, I am able to reproduce it by invoking the screenshot interface while the cat is being redrawn:
https://github.com/user-attachments/assets/9e9ed409-56e0-4b68-81e9-b002781b868a

Using Niri v25.01 on NixOS 25.05.
Chipset is a Core Ultra 7 155U with integrated graphics.

[Anomalocaridid]

this occurs seemingly at random times on my system, I am able to reproduce it by invoking the screenshot interface while the cat is being redrawn: https://github.com/user-attachments/assets/9e9ed409-56e0-4b68-81e9-b002781b868a

Using Niri v25.01 on NixOS 25.05. Chipset is a Core Ultra 7 155U with integrated graphics.

I can reproduce it on my system with the screenshot interface as well.

Edit: Although I also noticed the cat does not have to be moving for the bug to trigger, it seems to just need to have moved since the bug last triggering.

[YaLTeR]

This is consistent with "cat redrawing while it's invisible" (the screenshot UI fully obscures it too).

I guess the next thing to try is to reproduce on anvil or cosmic-comp to see if it's a Smithay issue. cosmic-comp should support ext-session-lock, so you can try with a lock screen there.