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Some changes to make things work better in the face of display aborting
and buffer modification during display output (due to servicing events in LISTEN.) The main change was making the redisplay functions return a meaningful value: T means did something, call again. NIL means did nothing (except possibly cursor positioning), can go into an input wait. :EDITOR-INPUT means redisplay aborted due to pending input. Also, changed the *SCREEN-IMAGE-TRASHED* logic to not clear the flag if dumb redisplay is aborted.
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