private JWindow getMatchingWindow() {
		// make sure our window has been created
		if (matchingWindow == null) {
			createMatchingWindow();
			return matchingWindow;
		}

		// We have a cached window, make sure it is still the current parent window (the window
		// may change when using modal dialogs while reusing this textfield).
		Window currentParentWindow = WindowUtilities.windowForComponent(this);
		if (currentParentWindow != matchingWindow.getParent()) {
			createMatchingWindow();
		}

		return matchingWindow;
	}
Removes the given listener from this class if it has previously been added.
@param listener The listener to remove.
Ghidra/Framework/Docking/src/main/java/docking/widgets/DropDownTextField.java