[jfx20] RFR: 8301832: InputMethodEvents are not enabled for text input controls [v2]

[Andy Goryachev]

> **Targeting jfx20 branch**
> 
> A fix for regression introduced by [JDK-8268877](https://bugs.openjdk.org/browse/JDK-8268877).
> 
> For IME to work, both `setOnInputMethodTextChanged()` and `setInputMethodRequests()` needs to be set, see Scene:2242.
> 
> The fix involves changing the code back to setting the control properties and doing so in the install() method.
> 
> Thank you Martin Fox  for noticing the issue!

Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:

  8301832: added test

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1024/files
  - new: https://git.openjdk.org/jfx/pull/1024/files/e91dd945..54db56ac

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1024&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1024&range=00-01

  Stats: 31 lines in 1 file changed: 31 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1024.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/1024/head:pull/1024

PR: https://git.openjdk.org/jfx/pull/1024