ScrollView scrollToContentEdge action goes into infinite loop

[dispatchMain]

ScrollView scrollToContentEdge action goes into infinite loop if scrollView's content size is smaller than scrollView's frame size. In general, the scrollView's content might be scrollable on smaller devices while same not content might not be scrollable on bigger devices. So, it is desirable that if content is smaller than scrollView's frame, the action scrollToContentEdge will not have any impact so that we could have device agnostic tests.

But currently the scrollToContentEdge action is going into infinite loop when content is smaller than scrollView's frame. #631 can be used to simulate the issue.