Send text selection changes for accessibility.

Change-Id: I3c50510ae9f995101d6e2c977c5138713389d71e
(cherry picked from commit 2cf1f24f93fa0f3f5bd7d38e160160a2c91d87f5)
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>

src/widgets/widgets/qlineedit_p.cpp

@@ -143,6 +143,9 @@ void QLineEditPrivate::_q_selectionChanged()
     }
 
     emit q->selectionChanged();
+#ifndef QT_NO_ACCESSIBILITY
+    QAccessible::updateAccessibility(q, 0, QAccessible::TextSelectionChanged);
+#endif
 }
 
 void QLineEditPrivate::_q_updateNeeded(const QRect &rect)