Specification for methods

javax.swing.JLayer.getScrollableTracksViewportWidth()
javax.swing.JLayer.getScrollableTracksViewportHeight()

Should not mention at all:

     * Returns {@code false} to indicate that the width of the viewport does not
     * determine the width of the layer, unless the preferred width
     * of the layer is smaller than the width of the viewport.

It is confusing as it's currently not so - even when delegation happens this assertion is not satisfied - see #6899145. The spec should also be updated to tell that if delegation doesn't happen the methods just return "false".