Fixes ClassCastException.
Also:
Envelope and star in Accounts Activity are now both "hot". Tapping
the main part of the search opens the full search; tapping the
envelope opens the search only for unread messages; tapping the star
opens the search but only for starred messages.
The envelope and star are a bit small to reliably tap. Both options
should be available via long-press, also.
Methodology will be extended to real accounts, as well.
Fixes Issue 1431
Present flagged message count inside a star, matching the visual
presentation on individual messages.
Provide display of unread and flagged message counts for canned
searches.
Perhaps the message counts for searches and account size display
should be defeatable for improved speed.
