This PR fixes an issue where the `DatePicker` is not committing his value when the focus is lost. As the ticket also mentions, this is a regression which last worked on JavaFX 8 and got broken by the refactoring: [JDK-8150946](https://bugs.openjdk.java.net/browse/JDK-8150946)
The fix is to provide the same api to the `DatePicker` which was introduced by [JDK-8150946](https://bugs.openjdk.java.net/browse/JDK-8150946) for `ComboBox` and `Spinner`. Note: While fixing this I found a possible bug which I tracked here: [JDK-8277756](https://bugs.openjdk.java.net/browse/JDK-8277756) -> When creating a `DatePicker` with the second constructor (with `LocalDate` as parameter) two listener won't be added since they are only added at the first constructor (That's also why I added the focusProperty listener in the second constructor). ------------- Commit messages: - 8191995: Regression: DatePicker must commit on focusLost Changes: https://git.openjdk.java.net/jfx/pull/679/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=679&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8191995 Stats: 133 lines in 2 files changed: 133 ins; 0 del; 0 mod Patch: https://git.openjdk.java.net/jfx/pull/679.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/679/head:pull/679 PR: https://git.openjdk.java.net/jfx/pull/679
