Crash on _NSViewValidateGeometry when editing a Timeline asset through a custom Editor window

Investigation

See this comment for investigation results and suggested solution: [Internal link]

Original report

Reproduction steps:
1. Open project “quantum_unity.zip”
2. Open “Window\UI Toolkit\TimelineEditorWindow” through the Main Menu
3. Select a Timeline Asset
4. Right-click on any Timeline Element and press “Move to frame”

Expected result: “Move to frame” window appears
Actual result: Editor crashes

Reproducible with: 2022.3.11f1
Couldn’t test with: 2021.3.31f1, 2023.1.16f1, 2023.2.0b13, 2023.3.0a9 (either TimelineEditorWindow doesn't work or doesn’t appear in Main Menu)

Reproducible on: macOS Sonoma 14.0 (Intel)
Not reproducible on: Windows 10

Note:

• The editor crashes with any option when right-clicking a Timeline Element, except “Locked”, “Delete” and “Constrain”

First few lines of StackTrace:

#0  0x007ff8138bd94c in _NSViewValidateGeometry
#1  0x007ff8138bda33 in NSViewValidateRect
#2  0x007ff812da22ec in -[NSView setFrame:]
#3  0x000001091784dc in -[GUIMetalView setFrame:]
#4  0x0000010916c584 in GUIView::SetPosition(RectT<float> const&)