RFR: 8089080: [TextArea] Caret disappear after pressing backspace to clear the content

[Ziad El Midaoui]

Fixed Caret disappear after unfocus then focus on the TextArea, the issue was happening because the caret position was set to -1 when we focus on the TextArea with empty text and caused the caret to disappear from at the skin level when the position is set to -1

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Commit messages:
 - Merge branch 'openjdk:master' into 8089080.CaretTextArea
 - Merge branch 'openjdk:master' into 8089080.CaretTextArea
 - Fixed Caret disappear after focus and unfocus

Changes: https://git.openjdk.org/jfx/pull/1787/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1787&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8089080
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1787.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1787/head:pull/1787

PR: https://git.openjdk.org/jfx/pull/1787