public default void toggleVisibility() {
		JComponent c = getFilterComponent();
		if (c.isShowing()) {
			c.setVisible(false);
		}
		else {
			c.setVisible(true);
			c.requestFocus();
		}
	}
Changes the visibility of the filter, make it not visible it if showing, showing it if
not visible.
Ghidra/Framework/Docking/src/main/java/docking/widgets/tree/GTreeFilterProvider.java