Geometry change was avoiding updating size of the QTextDocument, thus
it was not able to right align before something else triggered size
change, e.g. a modification to the text. Also removed unnecessary
cursorRectangleChanged signal that was emitted when moving focus with
mouse.

Change-Id: I293fd5119473eb3def5acd1b3fbb951c12e14412
Reviewed-by: Joona Petrell <joona.t.petrell@nokia.com>