[jfx17u] RFR: 8303026: [TextField] IOOBE on setting text with control characters that replaces existing text

[Johan Vos]

Almost clean backport of JDK-8303026
The test that is part of this backport is added manually, because of the large offset.

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Commit messages:
 - Add test that is part of the original patch (but with a large offset)
 - 8303026: [TextField] IOOBE on setting text with control characters that replaces existing text

Changes: https://git.openjdk.org/jfx17u/pull/117/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=117&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303026
  Stats: 15 lines in 2 files changed: 14 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx17u/pull/117.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u pull/117/head:pull/117

PR: https://git.openjdk.org/jfx17u/pull/117