Does it support wlr-layer-shell?

[GGshcka]

I ran into a problem where my application using wlr-layer-shell simply crashes after waking up from sleep. This doesn’t happen on other WM (in my case, Hyprland).

[dawsers]

It should support the wlr_layer_shell extension. scrollnag and scrollbar use that extension.

If your application is public, maybe you can share a link and I will take a look. If it is not, try sway. If it works there, it should work under scroll too. If it doesn't, it is a bug.

[GGshcka]

It looks like I was mistaken. I tested it on Sway and I also get the error "qt.qpa.wayland: There are no outputs - creating placeholder screen" after resuming from suspend. But for some reason, this doesn’t happen on Hyprland. If you’re interested, here’s what I’m doing: My QtQuick 6 bar

[dawsers]

Hyprland doesn't use wlroots any more, and this issue seems related to the way wlroots destroys outputs. Your shell may be trying to render to a non-existing monitor. There seems to be a workaround by using QApplication::screenAdded to detect when there are screens connected. There are a lot of details here.

However, before doing that, are you using scroll 1.11.5 or the git version? 1.11.5 depends on wlroots 0.19. and the development version uses wlroots 0.20. It seems there were some changes in wlroots 0.20 that affect how monitor disconnections are handled. So if you are on 1.11.5, I would first try the git version (or compile scroll yourself and link statically to wlroots 0.20) and see if the problem also exists there.

[GGshcka]

There seems to be a workaround by using QApplication::screenAdded to detect when there are screens connected.

Unfortunately, this didn’t work for me. I tried implementing a similar approach.

I’m indeed using the AUR 1.11.5 version. As soon as I get the chance, I’ll try the git version right away. Otherwise, I’ll try rewriting the outputs and figuring out how it works.