focusAcceptableProperty

If a mouse is clicked on a node, should it request the focus? For controls which can be read-only (such as TextArea / TextField), we may want to jump over them when pressing Tab (i.e. focusTraversable = false), but if the are clicked, then they should accept input focus. The user may wish to select, and copy part of the text.

Typically, when clicked, a node should navigate up the scene graph to find the first focusAcceptable Node. e.g. the up/down buttons in a Spinner should cause the Spinner to gain focus, not the button. Similarly to the container of a TextArea, the container should never have focus itself.