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window: Return -1 if meta_window_get_monitor is called on an unmanaged window

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As opposed to crashing. In this case, letting the caller deal with
it is the best policy, since this is public API.

https://bugzilla.gnome.org/show_bug.cgi?id=788834

(cherry picked from commit 8626c69c2f)
This commit is contained in:
Sam Spilsbury 2017-10-10 16:39:40 +00:00 committed by Ray Strode
parent eda1b3ba67
commit f607df49ec
1 changed files with 5 additions and 1 deletions
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6
src/core/window.c
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@ -3752,11 +3752,15 @@ maybe_move_attached_dialog (MetaWindow *window,
*
* Gets index of the monitor that this window is on.
*
* Return Value: The index of the monitor in the screens monitor list
* Return Value: The index of the monitor in the screens monitor list, or -1
* if the window has been recently unmanaged and does not have a monitor.
*/
int
meta_window_get_monitor (MetaWindow *window)
{
if (!window->monitor)
return -1;
return window->monitor->number;
}