RFR: 8281966: Absolute path of symlink is null in JFileChooser

[Tejesh R]

Absolute path of Symbolic Link created in Windows is set to `null` in `BasicFileChooserUI` class. This happens when propertyChangeListener is implemented to get the Symbolic link's Absolute path on Mouse click through JFileChooser. The reason being that on click of Symbolic link, the _ValueChanged()_ in `BasicFileChooserUI` class has a logic which actually sets the  `chooser.SelectedFile()` to `null` even though the path is not null. Hence the issue is addressed by checking if its a Symbolic link and then setting the `chooser.SelectedFile()` to the value of clicked link without modifying the other logics.

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

Commit messages:
 - Frame dimension update
 - Fix : Checking if its symlink and setting to file
 - Merge remote-tracking branch 'upstream/master'
 - Merge remote-tracking branch 'upstream/master'
 - Merge remote-tracking branch 'upstream/master'
 - Merge remote-tracking branch 'upstream/master'
 - Merge branch 'master' of github.com:TejeshR13/jdk
 - Merge branch 'openjdk:master' into master
 - Merge remote-tracking branch 'upstream/master'
 - Merge remote-tracking branch 'upstream/master'
 - ... and 2 more: https://git.openjdk.org/jdk/compare/c7c20661...82612a0a

Changes: https://git.openjdk.org/jdk/pull/9597/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9597&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8281966
  Stats: 112 lines in 2 files changed: 111 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9597.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9597/head:pull/9597

PR: https://git.openjdk.org/jdk/pull/9597