Image information and repo information are now both stored somewhere
else entirely, so we don't need to keep accessing weird API return
values to sort things out. fetchImageInfo now uses those classes to
an extent, and we now cache thumbnail URLs for different sizes.
Change-Id: Ife8293c86683ea914b1a5a60000584b501d92e55
Not when going prev/next.
The saved position feature was probably broken as well if you
happened to press prev/next.
This was my mistake for not noticing that attach() runs on
prev/next.
Bug: 59861
Change-Id: Ic6ff4b15a54178fb5d38640317650f5676293083
