Version upgrade/downgrade confirmation dialog buttons misaligned

[romlok]

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Godot version

v4.1.stable.official [970459615] < Steam

System information

Godot v4.1.stable - Debian GNU/Linux trixie/sid trixie - Vulkan (Mobile) - dedicated NVIDIA GeForce GTX 1060 (nvidia) - Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz (6 Threads)

Issue description

After Godot got upgraded 4.0 -> 4.1, when opening a project from the earlier version, I noticed that the buttons in the confirmation dialog look a bit squiffy:

(Somewhat aside, but that dialog should probably be able to deduce and be more precise about whether it's an upgrade or downgrade!)

Steps to reproduce

1. Have a project from Godot 4.0
2. Upgrade Godot to 4.1
3. Open project manager

Alternatively:

1. Create a new project in 4.1
2. Quit Godot
3. Edit the project.godot's config/features to read 4.0 instead of 4.1
4. Open project manager

Minimal reproduction project

default.zip

[Calinou]

Note that the button offset is swapped around on Windows, as evidenced in the screenshot present in https://github.com/godotengine/godot-proposals/issues/7254.

[kleonc]

Same issue as in https://github.com/godotengine/godot/issues/50192#issuecomment-874785436. Such custom added button is being hidden: https://github.com/godotengine/godot/blob/7030ac555f6af936174097c4642e60c1a6b0877b/editor/project_manager.cpp#L2257 but the spacer remains visible.