So, we talked about this. I think we should definitely remove this because it does not belong in core. No core functionality uses this, and it broke stable5. The Pictures app doesn’t use it either.

If any apps rely on this div, they need to be changed for ownCloud 6 (and since they can just use a custom ID, it will still work for ownCloud 5 etc). Of course we should:
* port the apps we know about (pdf viewer, odf viewer, any others?)
* mail to the list that this will be removed in ownCloud 6 and how to do it instead (some ```$('body').append('<div id="customdiv"></div>');``` for example)