bug#25818: 25.2; frame moved off display does not return (OS X)

[Charles A. Roelli]

Hi Anders,

As discussed off-list, the copyright assignment is done.

I fixed the patch so that child frames are never constrained (after some 
testing, it seems that a child frame cannot get stuck off screen as long 
as its parent is still visible).  To test this out, evaluate the 
following from emacs -Q,

(progn
  (setq test-frame (make-frame `((parent-frame . ,(selected-frame)))))
  (set-frame-position test-frame 0 500))

and drag the parent frame down until its child is off screen. When the 
parent is moved back up, the child should reappear with it.  (Assuming 
Spaces is off; not sure what would happen in OS X 10.9+ in this case 
when Spaces is on... I guess the child would be constrained before it is 
placed off screen?).

I've also CC'ed Alan since this change is related to the new frame 
parameters.

Cheers,

Charles

0001-Constrain-non-child-frames-to-screen-area-in-OS-X.patch
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