MathJAX: after loading, HTML dimensions may have changed (render pass), need to refresh column-pagination

[danielweck]

...otherwise, the number of pages (columns) is determined based on the HTML dimensions that do not reflect the final render.

[danielweck]

Perhaps something along the lines of:

https://github.com/readium/readium-shared-js/blob/develop/js/views/iframe_loader.js#L119

(here, the "done" callback is only invoked upon completion of a timed MathJAX task...but not sure how many equations are rendered exactly)

[danielweck]

Test EPUB:

https://github.com/readium/readium-js-viewer/tree/develop/epub_content/linear-algebra

(some pages are really quite heavy...long wait time before render complete...but I think the column-pagination does not compute the correct number of pages)

[ryanackley]

The 8 second timeout was causing this.

If we are going to have a timeout, we should show an error since pagination would be broken if we tried to continue. I've removed the timeout for now.

[danielweck]

8s timeout removal:
readium/readium-js@626472a

[danielweck]

See readium/readium-shared-js#82 for more information from MathJAX devs.