public static void hideAllWindows() {
		for (WeakReference<PopupWindow> weakReference : VISIBLE_POPUPS) {
			PopupWindow popupWindow = weakReference.get();
			if (popupWindow != null) {
				popupWindow.hide();
			}
		}
	}
A generic window intended to be used as a temporary window to show information.  This window is
designed to stay open as long as the user mouses over the window.   Once the user mouses away,
the window will be closed.
Ghidra/Framework/Docking/src/main/java/docking/widgets/PopupWindow.java