RFR: 8316947: Write a test to check textArea triggers MouseEntered/MouseExited events properly [v3]

[Ravi Gupta]

> Write a test to check textArea triggers MouseEntered/MouseExited events properly
> 
> MouseEntered should be triggered only when the mouse enters the component and MouseExited should be triggered when the mouse goes out of the component.
> 
> In TextArea, when we moved the mouse inside the component MouseMoved events are triggered properly. But when we slowly took the mouse outside the component that is towards the scrollbars, we could see a MouseEntered event being triggered followed by MouseExited.(before actually mouse enters the scrollbar)
> 
> Testing:
> Tested using Mach5(20 times per platform) in macos,linux and windows and got all pass.

Ravi Gupta has updated the pull request incrementally with one additional commit since the last revision:

  8316947: Review comments solved

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15961/files
  - new: https://git.openjdk.org/jdk/pull/15961/files/a9518ac5..4a57de9b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15961&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15961&range=01-02

  Stats: 13 lines in 1 file changed: 2 ins; 4 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/15961.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15961/head:pull/15961

PR: https://git.openjdk.org/jdk/pull/15961