[jfx17u] RFR: 8273336: Clicking a selected cell from a group of selected cells in a TableView clears the selected items list but remains selected

[Johan Vos]

clean backport of 8273336: Clicking a selected cell from a group of selected cells in a TableView clears the selected items list but remains selected

Reviewed-by: mstrauss, aghaisas

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Commit messages:
 - 8273336: Clicking a selected cell from a group of selected cells in a TableView clears the selected items list but remains selected

Changes: https://git.openjdk.org/jfx17u/pull/66/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=66&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8273336
  Stats: 116 lines in 5 files changed: 111 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jfx17u/pull/66.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u pull/66/head:pull/66

PR: https://git.openjdk.org/jfx17u/pull/66