Returns true if the LookAndFeel returned RootPaneUI instances support providing Window decorations in a JRootPane.

The default implementation returns false, subclasses that support Window decorations should override this and return true.

Returns:  true if the RootPaneUI instances created by this look and feel support client side decorations

See also:
JDialog.setDefaultLookAndFeelDecorated, JFrame.setDefaultLookAndFeelDecorated, JRootPane.setWindowDecorationStyle

Since:  1.4