bug#23377: 25.0.93; Completion is extremely slow for insert-char

[Drew Adams]

> not display those ugly boxed and useless hexadecimal numbers, 

They are not useless (and not particularly ugly).

Based on our experience with your over-the-top sensitivity
about what you perceived as "ugly" `...' quoting, we might
do well not to listen too much to your suggestions to remove
other things in Emacs that you find "ugly". ;-)

(In any case, removal of any sets of chars as completion
candidates should be under user control, not hard-coded.)