Jonas Jenwald 0ac1fba2f9 Prevent PDFHistory._tryPushCurrentPosition() from effectively becoming a no-op if the document hash contains an invalid/non-existent destination
By using the (heuristic) `POSITION_UPDATED_THRESHOLD` constant, we can ensure that the current document position will be added to the browser history when a sufficiently "large" number of `updateviewarea` events have been dispatched.
2017-08-30 19:45:13 +02:00
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2017-08-30 19:45:13 +02:00
2017-08-30 19:45:13 +02:00