RFR: 8296621: Stage steals focus on scene change [v2]

[Thiago Milczarek Sayao]

> Simple fix to not requestFocus() on scene change.
> 
> The attached bug sample shows that the TextField focused on the scene remains focused when the scene comes back.

Thiago Milczarek Sayao has updated the pull request incrementally with one additional commit since the last revision:

  Add test

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Changes:
  - all: https://git.openjdk.org/jfx/pull/940/files
  - new: https://git.openjdk.org/jfx/pull/940/files/c3252bd0..113e472a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=940&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=940&range=00-01

  Stats: 93 lines in 1 file changed: 93 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/940.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/940/head:pull/940

PR: https://git.openjdk.org/jfx/pull/940