Bug #3286

Fullscreen mode flickers and stutters with tabbing out

Status:	Open
Priority:	High
Added by:	VioletError on May 7, '26
Assigned to:	Unassigned
Due date:
Reported for:	9.6.2
Actual Result:	switches to another window with Alt+ Tab while causing flickering, stutters, etc
Expected Result:	switch to another window with Alt + Tab
Severity:	Unknown
Reproducibility:	Always
Platform:	Steam
Additional Notes & Comments:	Not set

Steps to Reproduce

1. press Alt + Tab to another window while in fullscreen
2. press Alt + Enter (to go to windowed mode)
3. press Alt + Enter (to go back to fullscreen)
4. press Alt + Tab to another window
5. press the maximize window button to go to windowed fullscreen
6. press Alt + Enter to go back to fullscreen (after this it shouldn't cause the same tabbing out issues other than the flicker/stutters)

Explanation

When in fullscreen mode, tabbing out/clicking out of the game causes a black flicker and the game to briefly stutter.

After it's switched to windowed mode and then going back to fullscreen with the Alt + Enter shortcut, the game gets quite buggy. The cursor can no longer move between monitors, and tabbing causes the game to go black, then shrink as if it were in window mode. Clicking back to focus reverts back to the proper size (while lagging).

Weirdly, after the game goes to windowed mode, rather than switching back to fullscreen with the Alt + Enter shortcut, if I instead click the maximize icon next to the X, and then press Alt + Enter to fullscreen, the game seems to "fix" itself. The cursor can now go between monitors again, and tabbing out now only causes the brief black flicker (the issues from the first paragraph).

This can be consistently reproduced

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