• KOReader version:all
• Device:all

Issue

onPageUpdate() methods runs twice on book open. It should run only one.

Steps to reproduce

Open new document in format epub or doc. For new and previously opened books.
I think that that line https://github.com/koreader/koreader/blame/master/frontend/apps/reader/modules/readerrolling.lua#L450 may be redundant for new books.
That line https://github.com/koreader/koreader/blame/master/frontend/apps/reader/modules/readerrolling.lua#L467 may be redundant for previously opened books.

I think that self:_gotoXPointer(self.xpointer) shouldn't be run when opening documents.