Almost every time when I remove rows, I get an assert.

I don't know if this is the right fix, but startRow has the previous rowCount.

Change-Id: I4e00fd5a2f618162c6d76ec26430234a2992c328
Reviewed-by: Continuous Integration (KDAB) <build@kdab.com>
Reviewed-by: Brett Stottlemyer <bstottle@ford.com>