[jfx11u] RFR: 8197991: Selecting many items in a TableView is very slow

[Johan Vos]

Co-authored-by: Naohiro Yoshimoto <yosbits at gmail.com>
Reviewed-by: kcr, aghaisas

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Commit messages:
 - 8197991: Selecting many items in a TableView is very slow

Changes: https://git.openjdk.java.net/jfx11u/pull/82/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=82&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8197991
  Stats: 403 lines in 5 files changed: 357 ins; 40 del; 6 mod
  Patch: https://git.openjdk.java.net/jfx11u/pull/82.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/82/head:pull/82

PR: https://git.openjdk.java.net/jfx11u/pull/82