Brion Vibber, 28/08/2014 18:39:
If we want to go fancy we can do something like what
the Gmail app does
when archiving a thread via a swipe in the thread list: leave a
placeholder item with an 'undo' button, then collapse it later such as
when scrolling down for more mails.
In case that's what's going on, this sort of enhancement should really
not be developed as platform-specific.
Nemo