bpo-35763: Make IDLE calltip note about '/' less obtrusive (GH-13791)


Add it to the end of the first line if there is room.  Tests were reworked.
(cherry picked from commit 949fe976d5c62ae63ed505ecf729f815d0baccfc)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
3 files changed