Hovering over UI items will pop up a tooltip hint if you are perfectly
still. This is easy when using a mouse since it is resting on a
surface. But with a tablet pen you are holding it off the surface so
absolute stillness is difficult. This PR allow a small amount of
movement. So unsteady or slow movement will still pop up the hint.
Pull Request: https://projects.blender.org/blender/blender/pulls/135602
edf2706f8c