Beautiful edges in Microsoft and other professional

[Wladefant]

Microsoft Whiteboard for example has these beautiful edges when drawing fast at the end. I think it would be nice to implement if it is achievable.

That works with input stabilization rather good, though not perfect

[personalizedrefrigerator]

As commented on the selection handles discussion, I hope to implement this soon, but for reference, the work done so far (which is very incomplete) can be found on this branch.