* This CL brings drag&drop move in line with the current document
describing its functionality in the Email app
Bug: 3135124
TODO: Assets and proper creation of the drag thumbnail based on
those assets
TODO: Review long-press behavior re: press on subject vs sender
Change-Id: I6e1ee1a1f055feb041a0338f2f5c775a88620595
* Drag & Drop "move to folder" preliminary implementation
* Use "drag handle" button to initiate drag
* Use the message list item itself as the drag thumbnail for
one item; "Move N messages" for multiple (not implemented)
* Disable MailboxList update during drag
* Use ListView itself as drag/drop target
Bug: 3138004
Change-Id: I9243e4f583cf91caa1b9dd04fd64d52e8b28fa30