(There's no option to create a new topic in the Android Feature Requests forum, so I'm posting here.)
I'm very glad you added the ability to pin emails, however the UX defeats the purpose somewhat. Whenever I navigate away from the inbox, or whenever the app is swapped out of memory, the pinned list collapses. Please make it retain whatever state it was last in. I.e., please make it so that if I expand the list, the list *stays* expanded until I choose to collapse it. Thanks!