Planning ScalaFX 8.0.40 release

[Jarek Sacha]

Java 8.0_u40 with many additions to JavaFX was released yesterday, including Spinner, TextFormatter, and dialogs. Most of those are already wrapped on SFX8u40 branch. It could be released as 8.0.40-R8.

One thing that I am not completely happy is the implementation for `Dialog[R].showAndWait()`. JavaFX version returns `Optional[R]`, ScalaFX implementation returns `Option[S]`. Type R is sometimes a JavaFX type. The implementation attempts to convert, when needed, the JavaFX type `R` to ScalaFX type `S`. This kind of works, but the returned type is not clean, it contains reference to implementation details. For instance, for `Dialog[String]`, `showAndWait()` should return `Option[String]` but it returns `Option[DConvert[String, (String) => Nothing]#S]`, it can be casted to `Option[String]`:

`dialog.showAndWait().asInstanceOf[Option[String]]`

but that is kind of ugly. Note it works OK with `Alerts`, so the main issue is with custom dialogs. Without casting, matching on dialog result does not always behaves as expected, something like

    val selectedItem = dialog.showAndWait() //.asInstanceOf[Option[String]]

    selectedItem match {
      case Some(s) => processString(s)
      case None =>
    }

will not compile when `processString(s:String)` needs `String` argument, though it curiously works in some cases.

Help needed here from a Scala types guru :)

I may just release it as is for now, since most of other new 8.0_u40 works fine, only `Dialog[R].showAndWait()` is shaky in custom dialogs . Thoughts?

Jarek