These changes use base classes for custom properties where possible for the `ExpressionHelper` logic (and in one case, all the bind logic as well) instead of duplicating these each time. As the base classes receive far more scrutiny, this should reduce bugs in these re-implementations.
------------- Commit messages: - Use base classes where possible Changes: https://git.openjdk.org/jfx/pull/1092/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1092&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8305885 Stats: 394 lines in 8 files changed: 73 ins; 253 del; 68 mod Patch: https://git.openjdk.org/jfx/pull/1092.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1092/head:pull/1092 PR: https://git.openjdk.org/jfx/pull/1092
