public default void activate() {
		JComponent c = getFilterComponent();
		if (!c.isShowing()) {
			c.setVisible(true);
		}
		c.requestFocus();
	}
Activates this filter by showing it, if not visible, and then requesting focus in the filter
text field.
Ghidra/Framework/Docking/src/main/java/docking/widgets/tree/GTreeFilterProvider.java