public void hide() {

		popup.setVisible(false);

		if (sourceComponent != null) {
			sourceComponent.removeMouseMotionListener(sourceMouseMotionListener);
			sourceComponent.removeMouseListener(sourceMouseListener);
		}

		sourceComponent = null;
	}
Area where user can mouse without hiding the window (in screen coordinates).  A.K.A., the
mouse neutral zone.
Ghidra/Framework/Docking/src/main/java/docking/widgets/PopupWindow.java