relayStylePagination concatenates edges when a query using after is repeated

[srmagura]

Intended outcome:
If you use relayStylePagination with a query that uses after, and the same query is performed twice with the same value of after, the incoming edges should replace the existing edges.

Actual outcome:
If you use relayStylePagination with a query that uses after, and the same query is performed twice with the same value of after, the incoming edges are concatenated to the existing edges. Now your paginated list shows the same page of data twice.

How to reproduce the issue:
Run the test in PR #9803.

Versions
Tested in the apollo-client repository as of 538b795.