private void createComboBoxListeners() {
		ItemListener leftListener = e -> comboChanged(e, LEFT);
		ItemListener rightListener = e -> comboChanged(e, RIGHT);
		comboListeners = new Duo<>(leftListener, rightListener);
	}
Constructor

@param provider the comparison provider associated with this panel
@param tool the active plugin tool
@param model the comparison data model
Ghidra/Features/CodeCompare/src/main/java/ghidra/features/codecompare/plugin/MultiFunctionComparisonPanel.java