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

From: Bill Evans
Subject: bug#30291: Acknowledgement (25.2; "ubuntu mono font" and "query-replace" (twice) hangs emacs)
Date: Wed, 18 Apr 2018 12:06:35 -0700
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

On 2018-04-17 13:01, Lars Ingebrigtsen wrote:
Bill Evans <address@hidden> writes:

Further information, as mentioned in a comment on StackOverflow

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
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.

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