why: when dragging to the very edge and the mouse leaves chart area the point sticks and you have to release the click and grab the point again. UX-wise looks not nice.
this PR enables dragging outside with a flag; the default behavior is not changed.
why: when dragging to the very edge and the mouse leaves chart area the point sticks and you have to release the click and grab the point again. UX-wise looks not nice.
this PR enables dragging outside with a flag; the default behavior is not changed.