Re-render single pages when paginating fixed layout

[Protected]

When the fixed layout renderer is in single page ("portrait") mode and the pages have different sizes and shapes, not re-rendering pages on #goLeft and #goRight can result (when the page change takes place within a spread) in pages retaining a downscale that matches a spread that's not visible, yielding a view with undesired margins/wasted space.

In the same circumstances, if paginating into the same page from outside the spread or directly using goTo, the page is re-rendered, which means it will take up the full available space. This is inconsistent and confusing.

This is a simple fix that ensures pages are always re-rendered in portrait mode and therefore always have the correct dimensions. I figured if the resize observer calls #render, it should be acceptable here as well, but feel free to amend the fix to make it more focused if possible.

[johnfactotum]

Rerendering is probably fine. Actually, maybe #goLeft and #goRight should just call #render?

[Protected]

If you want to redesign it like that. I noticed goToSpread already calls #render, such that when I paginate using goTo this problem doesn't happen.

[johnfactotum]

Yeah. So my understanding is that, in #goLeft and #goRight, it should probably call #render instead of setting style.display?

[Protected]

Like this, I suppose?