disable pull-to-refresh when in search
simplify tracking for search
star conversation in search
fix track name for search button clicked
also search local database for subject, body, sender, receiver
search for local messages in realtime when typing in search bar; compromise on local search
cleaning
add a timer to improve performance, search only when text is not edited in 0.4 second
search on gmail after another 0.4 second no editing
Fix cut-off in email body of message to the right margin
stop showing status bar notification when searching, improve local searching performance
only update remote search result when search keyword and current search bar text match
delay remote search
delay local search
improve performance
change "trash icon" to "archive icon" in email detail view