force
Renders all reflowable content documents in the ReaderView in order to calculate the exact number of pages for the current ReaderView configuration and view dimensions. (Number of pages for fixed layout documents are already known).
WARNING: This is a very expensive operation that will take a long time to complete on large reflowable publications.
The resulting rendition is highly volatile and will be invalidated on any change to ReaderView configuration (such as font-size change), or view dimensions (such as window resizing or orientation change).