protected void assertMatchingWindowHidden() {
		JWindow window = textField.getActiveMatchingWindow();
		if (window == null) {
			return; // null means not active
		}
		assertFalse(window.isShowing());
	}
The 'selectedValue' made after the user makes a choice
Ghidra/Framework/Docking/src/test/java/docking/widgets/AbstractDropDownTextFieldTest.java