java/awt/Frame/MaximizeUndecoratedTest.java fails in OEL due to a slight color 
difference in the background color. This is currently reproduced only for 
Oracle Linux. 

The Color object I'm getting for each of these Point objects:
new Point(maxBounds.x + OFFSET, maxBounds.y + OFFSET) --> 
java.awt.Color[r=0,g=255,b=0]
 new Point(maxBounds.width - OFFSET, maxBounds.y + OFFSET) --> 
java.awt.Color[r=0,g=207,b=0]
 new Point(maxBounds.width - OFFSET, maxBounds.height - OFFSET) --> 
java.awt.Color[r=0,g=255,b=0]
 new Point(maxBounds.x + OFFSET, maxBounds.height - OFFSET) --> 
java.awt.Color[r=0,g=255,b=0]
 
So, the issue occurs for the second Point object --> new Point(maxBounds.width 
- OFFSET, maxBounds.y + OFFSET) - java.awt.Color[r=0,g=207,b=0]


Fix:
When the offset is increased from 2 to 3, it works fine in all the platforms.

Testing:
Tested using mach5 in all the available platforms and it works fine 
everywhere(results attached in bug).
Tested manually in OEL 8 and it works fine there also.

-------------

Commit messages:
 - 8337886: java/awt/Frame/MaximizeUndecoratedTest.java fails in OEL due to a 
slight color difference

Changes: https://git.openjdk.org/jdk/pull/20486/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20486&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337886
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20486.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20486/head:pull/20486

PR: https://git.openjdk.org/jdk/pull/20486

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