I've got a cross-mode sketch which needs a ".java" tab when in "Java Mode".
But when trying to change to "JS Mode", it refuses to when non-".pde" files are present!
That is going on even in Processing 2. And it's now present for Processing 3 too.
Of course I don't want for both "JS & CS Modes" to recognize & display tabs which aren't ".pde", ".js" or ".coffee".
http://forum.Processing.org/two/discussion/12532/windowjs-cross-mode-alert-confirm-prompt-other-js-api-for-java