Looks good in v0.0.18 build cc1f350. When user tries to open a book which is already open in a card, then a pop-up is shown at the bottom of screen that the "Book is already open", hence preventing the users to open multiple cards with the same book.
Looks good in v0.0.18 build cc1f350. When user tries to open a book which is already open in a card, then a pop-up is shown at the bottom of screen that the "Book is already open", hence preventing the users to open multiple cards with the same book.