Make QLineEdit unit test pass again

Make QLineEdit unit test pass again

Widget failed to update cursor position if selection remained the same, but
changed direction, and did not emit selectionChanged if change resulted
from input method event.

Change-Id: I6a4ae48d41efa5e126980749f89982f92e3ec499
Reviewed-on: http://codereview.qt-project.org/6131
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Joona Petrell <joona.t.petrell@nokia.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>