[PDFHistory] Prevent the history from skipping entries in certain edge cases, when specifying an initialBookmark in the hash parameters on document load
Merge pull request #3691 from Snuffleupagus/PDFHistory-followup-3341

[PDFHistory] Prevent the history from skipping entries in certain edge cases, when specifying an initialBookmark in the hash parameters on document load
Implement a Two Page View Mode