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

[Charles A. Roelli]

Hi Anders,

Following your idea, here's an updated patch that works equivalently.
Please let me know what you think.

> Anyway, I think that we're on the right track and I appreciate that you
> have taken time to work on this!

My pleasure!

> PS. I just found another, unrelated, problem, when comparing the NS and X11
> versions. When passing a negative value to `set-frame-position' it is
> supposed to place the frame relative to the right/bottom border of the
> display, but in the NS version it doesn't. (The X11 version gets the Y
> placement wrong with 48 pixels, but that is another story.)

Hm... but what if a second display is in the negative coordinate space?
How would you place a frame on it programmatically?  In any case I'll
try to build the X11 version and see how it does it -- I wasn't aware
that it still works on Mac OS.

Cheers,
Charles

>> A quick test on 10.6:
>>
>> (setq ns-auto-hide-menu-bar t)
>>
>> ;; Places the frame just above the top of the screen.
>> (set-frame-position (selected-frame) 0 -20)
>>
>> ;; Frame would be completely offscreen; so it's constrained and brought
>> ;; back.
>> (set-frame-position (selected-frame) 0 -10000)

0001-Constrain-frames-to-visible-area-of-screens-in-OS-X-revised.patch
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