[api-minor] Slightly tweak/improve various code related to XFA-printing#13613

Merged

timvandermeij merged 3 commits intomozilla:masterfrom Snuffleupagus:xfa-printing-tweaks

Jun 23, 2021

+109-82

Commits on Jun 23, 2021

Move the getXfaHtmlForPrinting helper function to its own file (PR 13411 follow-up)
Snuffleupagus
committed
Switch the order of the "display"/"print" intent handling in XfaLayerBuilder.render
Snuffleupagus
committed
[api-minor] Add a new getXfaPageViewport helper function to support printing
Snuffleupagus
committed