RFR: 8306121: Scene not rendered initially when changing scenes after fix for JDK-8296621

[Thiago Milczarek Sayao]

I replicated the fix on #1054 on Linux.

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

Commit messages:
 - fix mistake
 - Scene not rendered initially when changing scenes after fix for JDK-8296621
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - ... and 30 more: https://git.openjdk.org/jfx/compare/48b5fea3...7d01a766

Changes: https://git.openjdk.org/jfx/pull/1110/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1110&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306121
  Stats: 36 lines in 4 files changed: 28 ins; 6 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1110.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1110/head:pull/1110

PR: https://git.openjdk.org/jfx/pull/1110