No "hide all" option for un-editable boxes of code

[fgoodman]

There is an option to hide specific methods in large blocks of un-editable code, but there is not an option to hide all of the un-editable code block. For instance, in the interp-state assignment for cs173, the extended data definitions window makes navigating the page pretty tedious, but if the extended data definitions could be "minimized", navigating the page would require much less scrolling.