RFR: JDK-8304933: BitSet (used for CSS pseudo class states) listener management is incorrect

[John Hendrikx]

JDK-8304933: BitSet (used for CSS pseudo class states) listener management is incorrect

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Commit messages:
 - Fix spelling error
 - Fix bug in BitSet listener management

Changes: https://git.openjdk.org/jfx/pull/1071/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1071&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304933
  Stats: 227 lines in 3 files changed: 224 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jfx/pull/1071.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1071/head:pull/1071

PR: https://git.openjdk.org/jfx/pull/1071