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

From: Bill Evans <[email-masked]>
Date: Wed, 18 Apr 2018 12:06:35 -0700

On 2018-04-17 13:01, Lars Ingebrigtsen wrote:
> Bill Evans <[email-masked]> writes:
>
>> 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.
> Is `query-replace' necessary to trigger the bug, or does evaling
>
> (message "%s" query-replace-from-to-separator)
>
> a couple of times also hang Emacs?
>

It is certainly noticeably slower than with other fonts, but I could not 
get it to actually hang emacs.