[issue39885] IDLE right click should unselect

Terry J. Reedy added the comment: Spinoff from #39852. At least the selection clear code added there should be pulled into a module level function and tested. -- ___ Python tracker

[issue39885] IDLE right click should unselect

New submission from Terry J. Reedy : In text editors, right click commonly brings up a context menu, often including Cut, Copy, Paste, and Delete, with inapplicable entries grayed out. There are at least 2 'standard' behaviors (at least on Windows) with respect to the cursor and selections.