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bug#31440: Can't redefine parent-frame on NS

From: Alan Third
Subject: bug#31440: Can't redefine parent-frame on NS
Date: Sun, 13 May 2018 10:40:54 +0100
User-agent: Mutt/1.9.3 (2018-01-21)

from emacs -Q:

set up three frames, a, b and c:

    (set-frame-parameter c 'parent-frame a)

c becomes child of a.

(set-frame-parameter c 'parent-frame b)

expected: c becomes child of b and is no longer child of a.

actual: c remains child of a, and b now cannot be raised above a and b.

(set-frame-parameter c 'parent-frame nil)

expected: c ceases to be a child frame.

actual: emacs crashes.

Patch attached.

If this is too late for 26.1 I don’t think that will be a huge issue
as it seems redefining parent-frame is not something people want to
do, and it’s unlikely to be something a user does by accident.
Alan Third

Attachment: 0001-Fix-redefinition-of-child-frames-on-NS.patch
Description: Text document

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