RFR: 8273324: IllegalArgumentException: fromIndex(0) > toIndex(-1) after clear and select TableCell [v3]

[Michael Strauß]

> This PR fixes the exception thrown by the sample code in [8273324](https://bugs.openjdk.java.net/browse/JDK-8273324), while retaining the incorrect behavior in the scenario described.

Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:

  fixed case of multi-selection across several rows

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/617/files
  - new: https://git.openjdk.java.net/jfx/pull/617/files/483130c0..c853c3e2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=617&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=617&range=01-02

  Stats: 14 lines in 2 files changed: 9 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jfx/pull/617.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/617/head:pull/617

PR: https://git.openjdk.java.net/jfx/pull/617