TextFloat does not work under Wayland

[michaelgregorius]

System Information

Arch Linux with Wayland

LMMS Version(s)

master

Bug Summary

Positioning the text float window does not work under Wayland. All text floats are shown at position (0, 0) instead of at the lower left corner of the main window like under X11.

The reason is that TextFloat::moveGlobal uses QWidget::move which is not supported under Wayland.

Expected Behaviour

The text float should not show at (0, 0).

Proposal: Implement a dedicated area where messages are shown and collected instead of using an ephemeral text float which users might miss to notice anyway.

Steps To Reproduce

Open a project that has been created with an older version of LMMS so that the text float which shows that information is displayed.

Please search the issue tracker for existing bug reports before submitting your own.

• I have searched all existing issues and confirmed that this is not a duplicate.

[regulus79]

I am on Arch Linux, Wayland, GNOME 47, and I cannot reproduce this issue. The TextFloats appear at the bottom left as usual for me.

[michaelgregorius]

Here's how it looks under KDE/Plasma with Wayland:

TextFloatWithKDEPlasma.webm

It's a bit surprising that it seems to work under Gnome as it is stated that Wayland does not allow clients to place windows. Are you sure that you are triggering a case where the text float window is a top-level window without a parent, e.g. in the way as described above?

[regulus79]

2024-12-20.11-31-27.mp4

[Rossmaxx]

Oops, wrong issue. Thought this was the PR.

[regulus79]

On closer inspection it appears that LMMS may not have been running on Wayland. Although GNOME says that my windowing system is Wayland, and everything I have checked appears to show that I am running Wayland, LMMS gives the following warning when it starts up:
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
I am not an expert on windowing systems, so I'm not sure what else it would be running on (XWayland?) But sure enough, when I set QT_QPA_PLATFORM=wayland, the LMMS window looks different, and I can reproduce this issue of the text floats spawning in the top left.

[michaelgregorius]

Yes, I guess that it is running through XWayland and that it therefore shows the same behavior as under X11. Although it's also interesting that the placing of windows seems to be allowed then under this setup. However that works. 😅