Usability:
Each time after adding a book to an existing collection, the interface "expands" (un-collapses) all collections. If you have a large 1st collection in the list, that means you never see what's in the next collections until you "collapse" (using "+" button) the first one(s). Ideally, the interface should maintain "collapsed" and "expanded" states of collections "as is", so that the user can choose how he wants to see them.
It's especially annoying that this happens after adding each book...
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