@Override
	public boolean isEnabled() {
		return textField.isEnabled();
	}
Adds the filter listener to this filter field that will be called when the filter
contents change.

<P>Note: this listener cannot be anonymous, as the underlying storage mechanism may be
using a weak data structure.  This means that you will need to store the listener in
a field inside of your class.

@param l the listener
Ghidra/Framework/Docking/src/main/java/docking/widgets/filter/FilterTextField.java