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Pin and unpin in one click. Every conversation in the list now has a pin beside its ⋯ button: faint gray on an unpinned conversation (click it to pin) and orange on a pinned one (click it to unpin); clicking the pin does not open the conversation. Pin conversation is now the first choice in Conversation options. The row's separate pin mark is gone (the button shows the state). Frontend only: no server, data or settings migration. Requested by Damon.