bug#52385: 29.0.50; Doc-View can't view separate pages in separate windows

[Lars Ingebrigtsen]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> Try this:
>
>     % emacs -Q some/multi-page.pdf
>     C-x 2
>     n n
>
> You'll see that the `n` changes the page in both windows.
> This was not the case in Emacs<29 where this could be used to view
> different pages of the same PDF in the exact same way we can view
> different "pages" of a text buffer when displayed in several windows.

I'm unable to reproduce this on the trunk.  I loaded a three page pdf,
`C-x 2', and `n n' took me to page three in the upper window only.

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