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

From: Anders Lindgren
Subject: bug#25818: 25.2; frame moved off display does not return (OS X)
Date: Mon, 3 Apr 2017 10:33:04 +0200


I think this is a good start. However, there is a case that your patch miss. If you have multiple monitors arranged in, say, an L-shape, a frame might be placed inside "multiscreenRect", without actually being visible on any screen. (This typically occur when you have a large desktop monitor connected to a laptop or when you have one monitor placed horizontally and one vertically.)

Fortunately, it should be easy to fix. What about something like (in pseudo-code):

     BOOL in_any_screen = NO;
     for (screen = /* Loop over all screens */ ...)
         if (overlapping(frame, scree))
              in_any_screen = YES;
     if ( ! in_any_screen )
         /* Move the frame in */

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

    -- Anders

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.)

On Sun, Apr 2, 2017 at 4:14 PM, Charles A. Roelli <address@hidden> wrote:
Hi Anders,

Does the attached patch work for you?  It's still a bit rough around the
edges, but seems to do the right thing.

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)


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