<Swing Dev> RFR JDK-8236635: JTabbedPane preferred size calculation is wrong for SCROLL_TAB_LAYOUT

[Prasanta Sadhukhan]

Hi All,

Please review a fix for an issue where it is seen the frame height is 
different in ubuntu19.10 when it contains JTabbedPane with 
SCROLL_TAB_LAYOUT policy compared to WRAP_TAB_LAYOUT policy.

Bug: https://bugs.openjdk.java.net/browse/JDK-8236635

Issue is because the native frame decorations are different in 19.10 
compared to 18.04, where the issue is not seen. Fix is to set the frame 
undecorated. The original issue 8215396 still fails with this modified 
test without the 8215396 fix.

diff -r 062b36ecf8d7 test/jdk/ProblemList.txt

--- a/test/jdk/ProblemList.txt  Thu Feb 20 14:49:20 2020 +0530
+++ b/test/jdk/ProblemList.txt  Fri Mar 13 21:56:05 2020 +0530
@@ -822,7 +822,6 @@
  javax/swing/JCheckBox/8032667/bug8032667_image_diff.java 8199063 
macosx-all
  javax/swing/JComboBox/7031551/bug7031551.java 8199056 generic-all
  javax/swing/JScrollBar/6924059/bug6924059.java 8199078 generic-all
*-javax/swing/JTabbedPane/TabProb.java 8236635 linux-all*
  javax/swing/JTree/8003830/bug8003830.java 8199057 generic-all
  javax/swing/plaf/nimbus/ColorCustomizationTest.java 8199080 generic-all
  javax/swing/SwingWorker/6432565/bug6432565.java 8199077 generic-all

diff -r 062b36ecf8d7 test/jdk/javax/swing/JTabbedPane/TabProb.java

--- a/test/jdk/javax/swing/JTabbedPane/TabProb.java     Thu Feb 20 
14:49:20 2020 +0530
+++ b/test/jdk/javax/swing/JTabbedPane/TabProb.java     Fri Mar 13 
21:56:05 2020 +0530
@@ -82,6 +82,7 @@
          panel.add(label);
          tabpanel.add("TEST", panel);
          add(tabpanel, BorderLayout.CENTER);
*+        setUndecorated(true);*
          setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

      }
Regards
Prasanta
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