correctly check window list size before removing from it
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@ -2832,7 +2832,7 @@ class PopupNotificationWindow:
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gajim.interface.roster.popups_notification_height -= self.window_height
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self.window.destroy()
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if len(gajim.interface.roster.popup_notification_windows) > 0:
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if len(gajim.interface.roster.popup_notification_windows) > self.index:
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# we want to remove the destroyed window from the list
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gajim.interface.roster.popup_notification_windows.pop(self.index)
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