RFR: 8297489: Write a test to verify the content change of TextField sends TextEvent [v2]

[ravi gupta]

> This testcase Verify the content changes of a TextField for the following assertions.
> 
> a. TextListener get invoked when the content of a TextField gets changed.
> b. TextListener not get invoked during text selection or when Special keys such as Function Keys are pressed.
> 
> 
> 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:

  8297489: bug added

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/11326/files
  - new: https://git.openjdk.org/jdk/pull/11326/files/dee8c8f9..dee88683

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11326&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11326&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11326.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11326/head:pull/11326

PR: https://git.openjdk.org/jdk/pull/11326