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window: don't crash on spurious calls to idle_calc_showing()
If idle_calc_showing() gets called when its queue is empty (which shouldn't happen), just return rather than crashing. https://bugzilla.gnome.org/show_bug.cgi?id=642957
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@ -2041,6 +2041,8 @@ idle_calc_showing (gpointer data)
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MetaWindow *first_window;
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MetaWindow *first_window;
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guint queue_index = GPOINTER_TO_INT (data);
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guint queue_index = GPOINTER_TO_INT (data);
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g_return_val_if_fail (queue_pending[queue_index] != NULL, FALSE);
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meta_topic (META_DEBUG_WINDOW_STATE,
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meta_topic (META_DEBUG_WINDOW_STATE,
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"Clearing the calc_showing queue\n");
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"Clearing the calc_showing queue\n");
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