@Override
			public void mousePressed(MouseEvent e) {
				if (tabPanel.isListWindowShowing()) {
					tabPanel.closeTabList();
					return;
				}
				tabPanel.showTabList(true);
			}
Component displayed when not all tabs fit on the tab panel and is used to display a popup
list of all tabs.
Ghidra/Framework/Docking/src/main/java/docking/widgets/tab/HiddenValuesButton.java