Semi-transparent bed (Preview tab) rendered as window transparency on Wayland

[valpackett]

Application version
4.7.1

Platform
FreeBSD, Wayfire, Qt 5.15.0

Reproduction steps

1. Go to the Preview tab when launched on Wayland backend

Screenshot(s)

Actual results
The semi-transparent bed is rendered as window transparency, showing windows behind the Cura window, like in
https://stackoverflow.com/questions/35245809/qt-opengl-translucent-objects-show-content-from-behind-window

(Wayland uses transparent surface formats for windows by default. You should use blend modes that don't change the framebuffer alpha. Or request a non-transparent surface format but Qt's client-side decorations have transparent corners..)

[Ghostkeeper]

Wow, weird issue! Stupid standards.

[Ghostkeeper]

We've discussed this with the team but decided it's not getting priority from us to fix this yet. It's not an issue that really hurts usability, and the proportion of users using Wayland is small. There are more important issues to fix that would benefit more people.

We'll leave this open as a known issue though. Maybe someone comes up with a fix at some point.

[github-actions]

Hi 👋,
We are cleaning our list of issues to improve our focus.
This bug seems to be older than a year, which is at least three major Cura releases ago.
It also received the label Deferred indicating that we did not have time to work on it back then and haven't found time to work on it since.

If this is still a problem for you in the current version of Cura, can you please leave a comment?
We will have a fresh set of eyes to look at it.

If it is not a problem anymore, you don't have to do anything, and this issue will be automatically closed in 14 days.

[valpackett]

Don't think it was actually fixed, though I don't currently have the setup to recheck this

[MariMakes]

Hey @valpackett,

Thanks for getting back to us.
We also don't have access to a setup to recheck if this issue is still present.
That would also make it hard to test if any solution if we could find one.

I'll be closing this issue, so we can focus on the most requested and needed features and bug fixes from our community and from UltiMaker, I hope you understand.

[jamesots]

I can confirm that this is still an issue in 5.3.1.

I may take a look at the code if I can get it building.

[zombielinux]

Can confirm the bug still exists.

[luka177]

The bug exists and is makinf it cura hard to use

[luka177]

[flaviut]

Some context from a similar application: swaywm/sway#6549 (comment)

Cura is extremely complicated to build so I can't test it myself, but could this be as simple as adding a call to setAlphaBufferSize in OpenGLContext?

See also: FreeCAD, OpenSCAD, Cura