+ <Space> - show the selected thread collapsing unmatched items
+ <Enter> - show the entire selected thread
+ a - archive message (remove inbox tag)
+ f - filter the current search terms
+ o - toggle search screen order
+ m - compose a new message
+ r - reply to thread
+ s - enter search criteria
+ ,s - alter search criteria
+ t - filter the current search terms with tags
+ q - return to folder display, or undo filter
+ + - add tag(s) to selected message
+ - - remove tag(s) from selected message
+ = - refresh display
+ ? - reveal the thread ID of what's under cursor
+ ^] - search using word under cursor