ignoring scrolling input when dragging on a plane

[MichaelBuessemeyer]

This PR disables scrolling while dragging a plane.

URL of deployed dev instance (used for testing):

• https://dontscrollwhiledragging.webknossos.xyz

Steps to test:

• Open some tracing.
• Scrolling should not work while dragging a plane.
• Scrolling should work when not dragging.
• Dragging so far that the mouse enters another plane and then scrolling still should disable scrolling.

Issues:

• fixes Improve Apple Magic Mouse support #3933

---

• Updated changelog
• [ ] Updated migration guide if applicable
• [ ] Updated documentation if applicable
• [ ] Adapted wk-connect if datastore API changes
• [ ] Needs datastore update after deployment
• Ready for review

TODO

• Handle the 4th behavior mentioned in steps to test.

[philippotto]

Excellent 🎉 The change works really well. I added a suggestion for the "drag into other plane and scroll there" problem. Didn't test it, though. If it works, I'll approve :)

[philippotto]

Works beautifully! See my one last minor comment, though :)