private void fireEditingCancelled() {
		listeners.forEach(l -> l.editingCancelled());
	}
Returns true if the value of this editor is valid.  Clients can use this to verify that the
user text is a valid script selection.
@return true if the valid of this editor is valid.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/script/ScriptSelectionEditor.java