Blank Gaps around borders of panels added to JSplitPane's are
undesirable...becomes very evident when several JSplitPane's are nested.

Using Swing 1.0.1 and JDK 1.1.5 - see attached test case.

To Reproduce: See the white gap below and to the right side of the
JSplitPane in the middle. This Horizontal JSplitPane is the first
created in SplitPanePanel.java on lines 78-83.

i.e.

middleSplitPane = new JSplitPane
                        (JSplitPane.HORIZONTAL_SPLIT, leftPanel, rightPanel);
middleSplitPane.setContinuousLayout(false);
middleSplitPane.setDividerSize(SplitPanePanel.DIVIDER_SIZE);
middleSplitPane.getAccessibleContext().setAccessibleName("Middle Split Panes");