fix: errors while fast-forwarding selection events #952
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In PR #936, @0jinxing added a great feature: recording and replaying selection. But in the fast-forward mode, all nodes are VirtualNodes (RRNodes). While applying these selection events, document.getSelection() can only recognize real nodes rather than virtual nodes. So that there will be errors in the fast-forward mode. In this PR, I fixed this bug and also improved the test case to cover this situation.