Project windows jump up after they appear on screen

[okla]

Godot version

v4.1.stable.official [9704596]

System information

Godot v4.1.stable - Fedora Linux 38 (Cinnamon) - Vulkan (Compatibility) - Mesa Intel(R) UHD Graphics 630 (CML GT2) () - Intel(R) Core(TM) i5-10505 CPU @ 3.20GHz (12 Threads)

Issue description

Project's main window and all windows created and shown from code jump up after they appear on screen. There is no such issue in 4.0.3.

May be related to #79888

Steps to reproduce

1. Create a new project
2. Create main scene with any node in it
3. Run the project

Minimal reproduction project

Bug.zip

[clayjohn]

What do you mean by "jump up"?

[okla]

@clayjohn Here are the subsequent frames of launching the attached project recorded in 4.1.1. As you can see in the last frame the window moves up (for the height of its top decoration I guess). There was no such behavior before 4.1.

[Calinou]

@okla Can you try following the same steps on 4.1 dev/beta/RCs? You can download them here.

Also, are you using a X11 or Wayland session? Use echo $XDG_SESSION_TYPE in a terminal to know.

[okla]

@Calinou It's X11. I'll test it on the betas a little later.

[okla]

@Calinou I've tested this issue on previous versions and it exists since 4.1.dev1 (4.2.dev2 is affected too). It's also not exclusive to compatibility mode and appears in all rendering modes (will correct the issue text and title).

[n0tank3sh]

Is this occurring with --single-window?
Edit: Most Important question. Is this occurring in any other window manager than Muffin? There was a commit(PR: #76040) made by me that changes the window position as it is assigned decoration(reparenting of the window). It's supposed to work on most window managers and this seemed to be an exception here. As I guess it's probably already changing the position of the window after decoration. I may be wrong here about the exact mechanism of it.

[okla]

@MightiestGoat Yeah, this occurs with --single-window (if I understand correctly that it should be passed to the editor on launch).

Unfortunately, I don't have another WM to test.

[reptofrog]

Same thing happens on GNOME Xorg and GNOME Wayland. Here's a recording:
screencast.webm

[okla]

What else can be done to fix this issue? Since it's a regression in 4.1.dev1 maybe some commit between it and 4.0.3 can simply be reverted?

[akien-mga]

@okla You can try to revert #76040 locally and see if that's indeed what caused the change.

As you can see in that PR and the linked issue, it fixes an issue which is the opposite of what you're experiencing, so simply reverting it won't really improve things, it will just make it worse for others.