RFR: 8129123: ComboBox popup list view does not scrollTo when ComboBox value/selection is set

[Craig Cavanaugh]

https://bugs.openjdk.java.net/browse/JDK-8129123

This pull request fixes JDK-8129123. This bug also effects Windows and Linux platforms.
Also, I believe JDK-8196037 is a duplicate of this issue.

I've tested this against OpenJDK 11.0.6 on Ubuntu 18.04, Arch Linux and Windows 10.

Thanks!

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Commit messages:
 - Fix for JDK-8129123

Changes: https://git.openjdk.java.net/jfx/pull/166/files
 Webrev: https://webrevs.openjdk.java.net/jfx/166/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8129123
  Stats: 51 lines in 2 files changed: 49 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jfx/pull/166.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/166/head:pull/166

PR: https://git.openjdk.java.net/jfx/pull/166