The burger button icon is jittering left and right when resizing docked Animation window

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Open the Animation window (Window > Animation > Animation)
3. Dock the Animation window 
4. Observe the burger button in the Animation window while resizing it left and right

Actual results: The burger button icon is jittering left and right 

Expected results: The burger button icon stays in it's position like all the other buttons

Reproducible with versions: 2022.3.66f1, 6000.0.58f1, 6000.1.16f1, 6000.2.4f1, 6000.3.0b1

Tested on (OS): macOS Silicon Sequoia 15.6.1

Notes:

• Doesn't seem to reproduce in other windows