The paint code doesn't invoke `stroke->redraw`
on `INBETWEEN_MOUSEMOVE` events. This causes
drawing lag on devices that tends to generate
more of them, like pen tablets.
The code no longer does this. It does still exclude
inbetween events for updating the paint cursor.
I checked, and only the two paint modes (3d texture paint and image paint) actually
use `stroke->redraw`. Both are implemented to only draw when necessary:
* `paint_2d_redraw` checks for `.need_redraw` flag on tiles.
* `paint_proj_redraw` checks `ProjStrokeHandle.need_redraw`.
I believe this may be the cause of #93796
Pull Request: https://projects.blender.org/blender/blender/pulls/110119
a1a08610b6