Demo test windows do not get refreshed correctly when window size enlarged.

Test Build: j2sdk1.4.1-rc (b16)
Test Enviroment: Windows2000 Pro/zh_TW
                 IA8/zh_TW.UTF-8
                 Sparc9 (32bit)/zh_HK.BIG5HK

Run Font2DTest demo on Win2K Pro/zh_TW with j2sdk1.4.1-rc(b16), enlarge the
demo window size, the enlarged part doesn't get displayed correctly. See
attached file for W2K (Font2DTest_win2000.bmp).

Run Font2DTest demo on IA8/zh_TW.UTF-8 and Sparc9(32bit)/zh_HK.BIG5HK with
j2sdk1.4.1-rc(b16), found similar problem. See attached file for IA8
(Font2DTest_IA8.gif).

SwingSet2 demo may have the same problem.