If you have a scripting console open, but not
fronted (e.g. docked into a background tab of
editor window) when you restart NB, profiling
shows that a noticeable chunk of startup time is
initializing the scripting console, though it is
unseen - some to load the Java editor kit (though
this would probably happen anyway); some to set
the document; some to load the script types.

Like CloneableEditor, should defer this stuff
until componentShowing.