MacOS: gitk freezes when resizing window

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After copying the config file, gitk opens and shows the theme correctly. However, resizing the window freezes the application. Resizing the panels do not cause it to freeze.

I've narrowed the offending config line to: set want_ttk 0 By removing it, gitk automatically fills it up (after a launch) with: set want_ttk 1

This makes resizing work without freezing.

Environment: Git v2.36.0 MacOS 12.3.1 CPU: M1 Max