public int getMaximumTabWidth( int tabIndex ) {
		JComponent c = (JComponent) getComponentAt( tabIndex );
		return clientPropertyInt( c, TABBED_PANE_MAXIMUM_TAB_WIDTH, 0 );
	}
Returns the maximum width of the tab at the given tab index.
flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/components/FlatTabbedPane.java