Jonas Jenwald f7b1da418f Center pages vertically in PresentationMode (issue 10906)
*This patch can be tested e.g. with the `sizes.pdf` document in the test-suite.*

While this patch isn't necessarily the best solution, e.g. it might be possible to solve this with *only* CSS, it's what I was able to come up with to address an old issue.
The solution here re-uses the `spread`-class in PresentationMode, since that one already takes care of centering pages *vertically*, together with a dummy-page that takes up the entire height of the window.

Finally, some PresentationMode-related CSS-rules are also simplified slightly, since the changes in PR 14112 (using Page-scrolling) allows some clean-up here.
2021-11-24 14:09:34 +01:00
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