[TEST_BUG] The content of the panel doesn't change when using scrollbars

Testsuite name: Regression
JDK/JRE tested: JDK8b111(64bit)
OS/architecture: win8.1-x64
Reproducible: Always
Reproducible on machine: win8.1-x64
Test run log location:
http://jsqalab.us.oracle.com/results/Evergreen/8/b111/regression/win8.1-x64/results-awt-part3/workDir/closed/java/awt/Panel/PanelRepaint/test.jtr
Test run result location:
http://jsqalab.us.oracle.com/results/Evergreen/8/b111/regression/win8.1-x64/results-awt-part3/workDir/closed/java/awt/Panel/PanelRepaint/


Steps to reproduce:
1.Download regression workspace from http://jre.sfbay.sun.com/java/re/jdk/8/promoted/ea/b111/ws/jdk/test/ to c:/regression
2.Install stable bundle JDK7u25b15 (download from http://jre.us.oracle.com/java/re/jdk/7u25/promoted/fcs/b15/bundles/windows-amd64/jdk-7u25-windows-amd64.exe) to C:/Java/jdk1.7.0_25
3. Install test bundle JDK8b111 (download from http://jre.us.oracle.com/java/re/jdk/8/promoted/ea/b111/bundles/windows-amd64/jdk-8-ea-windows-amd64.tar.gz) to C:/Java/jdk1.8.0
4.Download and unzip Jtreg from http://jre.us.oracle.com/java/re/jtreg/4.1/promoted/fcs/b02/bundles/jtreg_bin-4.1.zip locate at c:/regression
5.Create the script regression.sh as follows and run it
export JT_JAVA=C:/Java/jdk1.7.0_25
C:/regression/jtreg/win32/bin/jtreg -v -m -ignore:quiet -jdk:C:/Java/jdk1.8.0 -r:C:/regression/results/reportDir -w:C:/regression/results/workDir C:/regression/test/closed/java/awt/Panel/PanelRepaint/test.html

 
Case Instruction:
   Using scrollbars or tab keys to scroll the panel and
   the panel is messy sometimes, e.g. one row bumps into
   another. Please ignore the illegibility of textfields on Solaris.
   That's not a problem. This bug only happens on Win32.
   Actually only on some of the NT machines. Also it's reproducible
   more often in Java Plugin and seldomly happens in Appletviewer.

Actual behavior:
The content of the panel doesn't change when we use scrollbars to scroll the panel refer to PanelRepaint.jpg