bug#19304: 25.0.50; vc-dir hangs forever

[Sam Steingold <sds@gnu.org>]

> * Dmitry Gutov <qthgbi@lnaqrk.eh> [2014-12-08 20:18:48 +0200]:
>
> On 12/08/2014 07:00 PM, Sam Steingold wrote:
>> No, your patch is not a solution.
>> 'C-x v d' now works, but 'g' in the *vc-dir* buffer hangs.
>> 100k ignored files is quite normal.
>> I have my home under hg and many git and hg repos in ~/src/ &c, and
>> the top-level hg ignores "~/src".
>
> Okay, it's more complicated, then. Do you see a change in which command
> is called? Specifically, the "i" from "-mardui" should be gone now.

yes, but only for vc-dir, not revert-buffer in *vc-dir*.
also this is only for hg not git and others

> Could you find out where most of the time is spent? The call to Hg, or
> some particular Emacs function.

some emacs function (-mardui takes ~10s).
dunno which - bug#19303 kills emacs when I set debug-on-quit to t and
try to C-g out of the frozen emacs.

note that it is _really_ easy to reproduce the problem:

1. clone emacs repo into dir1
2. clone emacs repo into dir2
3. mv dir1 dir2/
4. add dir1 to dir2/.gitignore


-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1343
http://www.childpsy.net/ http://openvotingconsortium.org
http://honestreporting.com http://mideasttruth.com
recursion, n: See recursion.