RFR: 8068293: [TEST_BUG] Test closed/com/sun/java/swing/plaf/motif/InternalFrame/4150591/bug4150591.java fails with GTKLookAndFeel [v3]

[Prasanta Sadhukhan]

> Test fails in GTKLookAndFeel with NPE
> 
> java.lang.NullPointerException
> at javax.swing.border.BevelBorder.<init>(BevelBorder.java:78)
> at javax.swing.BorderFactory.createBevelBorder(BorderFactory.java:155)
> at com.sun.java.swing.plaf.motif.MotifInternalFrameTitlePane$Title.<init>(MotifInternalFrameTitlePane.java:325) 
> 
> because `BorderFactory.createBevelBorder` tries to use brighter shade of highlight and shadow color which it tries to obtain from 
> `UIManager.getColor("activeCaptionBorder")` and `UIManager.getColor("inactiveCaptionBorder")` both of which are not defined in GTK L&F as caption border are not used there
> 
> Fix is made to not use these color to create BevelBorder if these colors are not present..

Prasanta Sadhukhan has updated the pull request incrementally with three additional commits since the last revision:

 - Use motif L&F in test
 - Use motif L&F in test
 - Use motif L&F in test

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27839/files
  - new: https://git.openjdk.org/jdk/pull/27839/files/cb9a559b..546b6caf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27839&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27839&range=01-02

  Stats: 17 lines in 2 files changed: 2 ins; 10 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/27839.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27839/head:pull/27839

PR: https://git.openjdk.org/jdk/pull/27839