Numbering leads to screen corruption after displaying completions

[johnsonjh]

Example: https://user-images.githubusercontent.com/61629094/153507022-928bebe5-b53b-432f-9561-2be43c91e306.MOV

[johnsonjh]

Alternate: https://user-images.githubusercontent.com/61629094/153507371-16ec2f6d-05e2-4379-92e6-3d46c506c10c.MOV

[johnsonjh]

lichray/nvi2#104 same bug.

[johnsonjh]

Added help wanted tag; any help on this would be appreciated, and any fix should be contributed to OpenBSD and Nvi2. Redraw via ^R/^L is a workaround for now.

Lack of external complaints seems to indicate this is not encountered too often (or isn't too annoying when it is).