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bug#754: Can't cancel dabbrev-expand (M-/) with C-g

From: David Caldwell
Subject: bug#754: Can't cancel dabbrev-expand (M-/) with C-g
Date: Thu, 21 Aug 2008 12:30:11 -0700
User-agent: Thunderbird (Macintosh/20080707)

Chong Yidong wrote:
If I have many buffers open (284 at the moment) and if I run
dabbrev-expand (M-/) to expand the word under my buffers then it
searches through every buffer and takes an understandably long
time. If I mispelled the word fragment then it never has a hope of
finding it and I'd like to cancel the operation. But C-g does not work
for some reason and so I have to wait a good 5 to 10 seconds for it to
finish scanning all my buffers. This gets very frustrating after the
third or fourth time.

I don't see why C-g wouldn't work here.  Could you apply the following
patch and see if the problem persists?  (This is not a fix; it's an
attempt to diagnose the problem.  As far as I know, quitting should not
be inhibited here.)

         ;; Walk through the buffers till we find a match.
!        (let ((inhibit-quit nil)
!            expansion)

I tried the patch but Emacs behaved the same as without it.


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