d5f25f998b
RegionMoveDrag::finished_no_copy() calls ::clear_changes() on every selected Region and then sets their positions again before committing the command to the UndoHistory. By doing that no changes from the previous transaction spill over into the current transaction. This needs to be done in a similar way by in RegionRippleDrag::finished() because otherwise a following undo action would also undo the changes of the previous transaction for all the non selected rippled regions. RegionRippleDrags across tracks are still borked, though.
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