Cancel moving when cursor exits grid (#476, fixes #405)
Cancel moving when cursor exits grid (#476, fixes #405)

* fix stuck issue on Move-selection

* Add explanatory comment for change

Co-authored-by: Jona Andersen <32067c66eb223ac1390e4ab6e1c57ac609af0eba@gmail.com>
TonyGermaneri/canvas-datagrid,TonyGermaneri/canvas-datagrid