In Blink-based browsers, there is a mismatch between document size and
paper size. Even if exactly the same values and unit are used, it is
possible that the printed results takes more pages than expected.
To solve the issue, the page size is set via @page size, and the canvas
and ancestor nodes are assigned a width+height of 100% (=relative to the
page). This change resolves bugs such as blank pages and split pages.
Set transformation matrix in (polyfilled) mozPrintCallback when a scale
is applied. Removed _scaleX and _scaleY in favor of _transformMatrix to
emphasize that the caller MUST ensure that the state of the matrix is
correct before `addContextCurrentTransform` is called.
In old versions of the viewer, anchor links were used to be able to scroll a page into view. Since we for quite some time have had a `scrollIntoView` function which handles this, the anchor links are no longer necessary and I believe that they can be removed. Doing so will reduce the total number of DOM elements in the viewer.
For most documents this patch will probably not make much of a difference performance wise, but for very long (1000+ pages) documents this could help performance especially on lower powered hardware.
