RFR: 8178368: Right and Center alignment of text field works incorrectly [v3]

[Karthik P K]

> When Text width was more than TextField width, the logic to update `textTranslateX` in `updateCaretOff` method was causing the issue of unexpected behavior for Right and Center alignment.
> 
> Made changes to update `textTranslateX` in `updateCaretOff` method only when text width is less than text field width i.e `delta` is positive. 
> For both right and center alignments, the `textTranslateX` value calculated in `updateTextPos` method will be updated without any condition so that expected behavior is achieved for all scenarios of text width relative to text field width. 
> 
> Added unit tests to validate LEFT, CENTER and RIGHT alignments. RIGHT and CENTER alignment tests are expected to fail without the fix provided in this PR.

Karthik P K has updated the pull request incrementally with one additional commit since the last revision:

  Update comments

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Changes:
  - all: https://git.openjdk.org/jfx/pull/980/files
  - new: https://git.openjdk.org/jfx/pull/980/files/337ad7ac..8c1cd0c2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=980&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=980&range=01-02

  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/980.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/980/head:pull/980

PR: https://git.openjdk.org/jfx/pull/980