Moved selection of selected rows in TableConnector to occur after the new rows are created (#13008)

The selection of selected rows happened before the new rows were created. This resulted in situation
where the visible items on server side were different than the rows in scrollbody during the selection
of selected rows. Therefore, the selected keys in uidl contained wrong information and some selected
rows was marked as unselected even though they shouldn't. This again resulted in the original bug that
all the rows was not selected because the 'selectionRangeStart' row was not selected anymore.

Change-Id: I9f985cb45c97bacb6b71e36fa4bf077a1ac1311d