Merge pull request #1844 from riezebosch/pdf-print-stretch

print-pdf layout slide contents to fit stretch elements

js/reveal.js

@@ -633,6 +633,9 @@
 		document.body.style.width = pageWidth + 'px';
 		document.body.style.height = pageHeight + 'px';
 
+		// Make sure stretch elements fit on slide
+		layoutSlideContents(slideWidth, slideHeight);
+
 		// Add each slide's index as attributes on itself, we need these
 		// indices to generate slide numbers below
 		toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {