Fix incorrect index when accumulating multiple removes.

Fix incorrect index when accumulating multiple removes.

Don't remove the intersecting count from the current remove twice,
and accumulate consecutive not just overlapping removes.

Change-Id: I426d764d980ee17ad114aa03ca4089da89c6aed2
Reviewed-on: http://codereview.qt-project.org/5902
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Andrew den Exter <andrew.den-exter@nokia.com>