Grease Pencil - Snap to vertex
GP stroke edit mode has a Snap feature to "snap to vertex". This seems to only work reliably when snapping to 3D objects, not to strokes in GP objects.
Suggest snap selected vertices to the closest (within tolerance) visible vertex from the mouse in all GP object strokes.
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To add to this, the "snap to edge" setting should snap the selected object along the stroke (not just the points)