I think you should be able to do:
toplevel .t -colormap ""
seeing as [. cget -colormap] returns an empty string.
Similarly:
toplevel .t -use ""
should not cause an error.
Logged In: YES user_id=98900
Fixed for 8.4.4 and 8.5.
Logged In: YES
user_id=98900
Fixed for 8.4.4 and 8.5.