I would prefer automatically added "- " to be removed automatically when pasted content starts by "- " followed by standard text (e.g. alphanumeric character), i.e. pasted text matches markdown list item syntax.
Similar situation occurs when caret is at the end of line and delete is pressed. Fixing it by pressing Enter (immediately or later) leads again to "- - ".
A post was merged into an existing topic: Intelligent Pasting of Lists