When a pdf file is opened with pdfium and then saved as odg, each page
is saved as a draw:image of the pdf. But since no page number info was
given, when opening the odg file, all the pages are shown as the first
one.
This adds a loext:page-number to the saved odg and the logic to load a
specific page from an embedded pdf.
Added loadGraphicAtPage to XGraphicStorageHandler.
Change-Id: I398b7ad7f03cc7fb930a4e7b7620c6f238b41c0d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/181066
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Jaume Pujantell
87f132a5e8