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core/window: Don't set a preferred output when there is none
If there are no active logical monitors, don't try to dereference a NULL one to get a preferred output winsys id. Instead just set an invalid one. https://bugzilla.gnome.org/show_bug.cgi?id=730551
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@ -1039,7 +1039,10 @@ _meta_window_shared_new (MetaDisplay *display,
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window->compositor_private = NULL;
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window->monitor = meta_window_calculate_main_logical_monitor (window);
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window->preferred_output_winsys_id = window->monitor->winsys_id;
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if (window->monitor)
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window->preferred_output_winsys_id = window->monitor->winsys_id;
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else
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window->preferred_output_winsys_id = UINT_MAX;
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window->tile_match = NULL;
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