Flag hidden text on Export
When exporting (to PDF, PNG, anything) scan to see if any text is hidden inside text boxes (of the artboards that are being exported) and warn the user that there is some hidden text. Just of the artboards or assets that are being exported, however. e.g. If I'm exporting pages 1 - 4, don't tell me there's some hidden text on page 5.
(look at InDesign for example of this functionality).
Nate Williams commented
this would be very helpful