ObservableValue::map called twice

[Nir Lisker]

Hi,

Running this code:

var label = new Label();
var tf = new TextField();
label.textProperty().bind(tf.textProperty().map(t -> {
    System.out.println("in");
    return t;
}));

produces the output::
in
in

>From what I see, the lambda should be called once, but it's called twice.
Looks like improper behavior to me.

- Nir
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