Moving the mouse around while docking the toolbox causes Roact errors

In the video you can see that:

  • Attempt 1 and 2: Docking the toolbox over the properties panel directly (even while the mouse is moved) doesn’t generate errors. Never mind, it just took a few more tries. See the second video.
  • Attempt 3 and 4: Docking the toolbox above the properties panel, and then over the properties panel (without moving the mouse) doesn’t generate errors.
  • Final attempt: Docking the toolbox above the properties panel, and then over the properties panel, and then moving the mouse around generates errors.

https://giant.gfycat.com/TimelyTartAnemone.webm

EDIT: Second video. It looks like you don’t need to dock the toolbox panel above the properties panel first to reproduce the bug after all.

https://giant.gfycat.com/BossyWhiteArizonaalligatorlizard.webm

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