Some updates were previously omitted, e.g. if text content
changed but cursor position remained the same, or if input
method changed the selection.

Change-Id: I11abd105632d73f8ebb23d0e8c308c53c236cc15
Reviewed-by: Joona Petrell <joona.t.petrell@nokia.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>