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[UI Toolkit] Debugger window is very slow with specific elements

UI Toolkit


Reproduction steps:
1. Create a new Project
2. Open UI Toolkit Debugger (Ctrl + F5 on Windows 10 or via Inspector ellipsis menu)
3. Select GameView (Game View needs to be visible)
4. Expand Visual Element #unity-panel-containerX
5. Select Visual Element #rootVisualContainerY
6. On the right of the window move the mouse across the margin, border, padding

Expected result: the selected area instantly lights up when the cursor is above it (like with other elements)
Actual result: the selected area lights up with a delay, it feels like the editor is lagging

Reproducible with: 2020.3.32f1, 2021.2.18f1, 2022.1.0b14, 2022.2.0a9
Not reproducible with: 2019.4.37f1

Tested on Windows 10

1. Resource monitoring software (Task Manager) indicates that CPU usage for the editor is less then usual if moving the cursor above the area in step 4 rapidly (with other elements there is no change in CPU usage)

  1. Resolution Note:

    There will probably be a refactor of the debugger at some point. We are prioritizing other areas at the moment, if you feel this is too important, please reopen the issue.

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