- Selection can start on top of preedit
 - Mouse press outside preedit commits
 - Double click to commit on top of preedit
 - Focus out to commit preedit

Similar to qtbase 4b3d88a9c67402b6a234d597bab25846f039bbdb and
b5c37d9e137dee2754335e83b8437dfd0e6cc7e7 for QTextEdit

Change-Id: Ib9c37528ba7fd588ee993b7ff33f79f96857e421
Reviewed-by: Andrew den Exter <andrew.den-exter@nokia.com>
Reviewed-by: Joona Petrell <joona.t.petrell@nokia.com>