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"Layout" workspace in attached file seems corrupted. The option to split panel is gone, and menus open but don't close!
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Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: TITAN X (Pascal)/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Blender Version
Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: rB0f45cab862b8
Worked: Well, never seen this before! I was using a wacom/cintiq on windows in dual screen setup, with blender set to full screen, and had just used the 'rotate view in 2D' shortcut when I noticed the issue.

Short description of error
Something seems to have become corrupted with this workspace. Panels can't be split, and when it's duplicated, UI doesn't update properly - menus that have been opened don't close (see video), changing workspace doesn't change, dialog boxes don't disappear!

Exact steps for others to reproduce the error
Load the attached file. Notice it doesn't have the option to split the panes in the tab named Layout. Duplicate the tab named Layout. Try the menus and dialog boxes. They open but don't close! Also, switching to the newly duplicated workspace doesn't actually change the workspace, it just keeps whatever workspace was there before! .

Event Timeline

It's as if it's maximized (ctrl+alt+space maximized, the characteristic icon appears when hovering over top right corner), but at the same time isn't, since header and main bar are visible.

I can reproduce this on Linux as well. ASAN doesn't report any errors.

Robert Guetzkow (rjg) changed the task status from Needs Triage to Confirmed.Jan 16 2021, 2:38 PM

Error is in screen code. That just causes other issues like the observed graphical glitches.