RFR: 8178368: Right and Center alignment of text field works incorrectly [v2]

[Karthik P K]

> When Text width was more than TextField width, condition to update `textTranslateX` was not getting satisfied as calculated value was negative. Hence the text was getting aligned to previous `textTranslateX` value.
> 
> Added else block to update the `textTranslateX` value when calculated value is negative.
> 
> Added unit test to validate the fix.

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

  Fix textfield right and center alignment issues

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Changes:
  - all: https://git.openjdk.org/jfx/pull/980/files
  - new: https://git.openjdk.org/jfx/pull/980/files/2238ec41..337ad7ac

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=980&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=980&range=00-01

  Stats: 63 lines in 2 files changed: 44 ins; 9 del; 10 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