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bug#25875: 26.0.50; Hang logging out of MS-Windows

From: Richard Copley
Subject: bug#25875: 26.0.50; Hang logging out of MS-Windows
Date: Sat, 25 Feb 2017 21:13:57 +0000

On 25 February 2017 at 20:36, Eli Zaretskii <address@hidden> wrote:
>> From: Richard Copley <address@hidden>
>> Date: Sat, 25 Feb 2017 19:41:25 +0000
>> Perhaps not a deadlock: I just ran "taskkill /im emacs.exe" and the
>> process woke up
>> and signaled a Lisp error:
>> Debugger entered--Lisp error: (error "Attempt to delete a surrogate
>> minibuffer frame")
>>   delete-frame(#<frame *Customize Option: Package Unsigned Archives*
>> 0000000400a51890> t)
> Is this indeed a surrogate minibuffer frame?  If so, how come it's
> being deleted?

An Ediff control-panel was present. The main frame was the
surrogate minibuffer frame for the minibufferless Ediff frame. In
that situation, clicking the close button on the main frame gives
that same error.

I surmise that WM_QUERY_END_SESSION goes down the same code
path (?).

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