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kotlinlang

I just noticed a small issue with builders that create fake panes. Concrete example, the `top` builder for `BorderPane`. The `op` block is executed on a `VBox`, and if the `op` invocation only adds a single Node to that `VBox`, that single Node is set as the `top` property of the `BorderPane`. If you add multiple children, the `VBox` is kept. The problem arises if you add only a single Node, but manipulate the VBox somehow, for example by adding classes to it or setting properties. Those classes and properties are lost when the VBox is then discarded.