Freelook 3d camera hides mouse forever when in 2 views mode with output tab open

[vPumpking]

Tested versions

4.2.3

System information

linux ubuntu24 apu intel

Issue description

when activating freelook camera with shift F in 2view mode with output tab open, the mouse isn't able to move the freelook camera and remains hidden until the editor is restarted

Steps to reproduce

open 3d project with a screen of res = 1366x768 and split up the 3d editor vertically, so they stack up. then open output tab and press shift F

Minimal reproduction project (MRP)

any standart project

[Calinou]

the mouse isn't able to move the freelook camera and remains hidden until the editor is restarted

You can press Shift + F again to exit freelook. Strangely enough, I can't press Escape to exit it (even in 3.5.2).

Edit: I opened a dedicated issue for this: #95141

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I can confirm this on 4.3.rc e343dbb (Linux X11).

freelook_stuck.mp4

In the 2 Viewports (Alt), 3 Viewports, 3 Viewports (Alt) and 4 Viewports modes, none of the viewports have working Shift + F freelook (only right mouse button works):

freelook_stuck_3_viewports.mp4

When using one of the above configurations, this issue doesn't depend on window size or resolution, although it can still vary depending on whether a bottom panel is visible. Here, the top viewport has working Shift + F freelook, but not the two bottom ones:

freelook_stuck_3_viewports_large.mp4

Notice how freelook works for a single frame if I move the mouse quickly before entering freelook on one of the broken bottom viewports.

What determines whether freelook works on the top viewport is likely whether its viewport rect is within the window's center, as evidenced by the diagrams here (the cross' intersection is the window's center):

Broken

Working (first viewport only)

Edit: This can occur even with only a single viewport if the screen's center isn't on the viewport:

[vPumpking]

I just noticed that if you open 2 views on top of another, set the bottom one to camera view, open the output tab and then press shift F in the upper view, the mouse remains completely stuck and you have to restart the editor

[Calinou]

I just noticed that if you open 2 views on top of another, set the bottom one to camera view, open the output tab and then press shift F in the upper view, the mouse remains completely stuck and you have to restart the editor

This is being tracked in #50051. It may have a separate cause and require a separate fix.