99df159ce0
There are other events besides `MOUSEMOVE` that's passed in during modal handling, causes the `tgpi->mvalo` variable to be overwritten without moving the stroke in the first place, this results in inaccurate offsets during mouse/pen grabbing in primitive gizmo `IN_MOVE` mode. Now fixed. Also fixed the operator hint to include the grab functionality. Pull Request: https://projects.blender.org/blender/blender/pulls/108172