bug#30291: Acknowledgement (25.2; "ubuntu mono font" and "query-replace" (twice) hangs emacs)

[Bill Evans]

Further information, as mentioned in a comment on StackOverflow 
(https://emacs.stackexchange.com/questions/38449/ubuntu-mono-font-hanging-emacs?noredirect=1#comment60603_38449):

Changing `query-replace-from-to-separator` to something trivial such as 
" -> " also fixes the problem. This suggests that there is (1) likely 
something "different" with Ubuntu Mono's interpretation of the 
right-arrow character, and (2) emacs is not dealing well with that 
different-ness.

(I recently upgraded to "GNU Emacs 25.3.1 (x86_64-w64-mingw32) of 
2017-09-12", the bug behaves the same. It originally became a problem 
when I upgraded from emacs24 to emacs25.)