resolves #490 support page layout per page

lib/asciidoctor-pdf/converter.rb

@@ -1929,7 +1929,14 @@ def convert_toc node
 
   # NOTE to insert sequential page breaks, you must put {nbsp} between page breaks
   def convert_page_break node
-    advance_page unless at_page_top?
+    opts = {}
+    # Detect if a page layout change was a role of the page break.
+    page_layout = resolve_layout_from_node node
+    opts = {
+              layout: (page_layout || page.layout),
+           }
+
+    advance_page opts unless at_page_top?
   end
 
   def convert_index_section node
@@ -3301,6 +3308,18 @@ def resolve_alignment_from_role roles
     end
   end
 
+  def resolve_layout_from_node node
+    if (layout = node.attributes['page-layout']).nil_or_empty? || !(PageLayouts.include?(layout = layout.to_sym))
+      if (layout = node.roles.reverse.find {|r| PageLayouts.include? r.to_sym })
+        layout.to_sym
+      else
+        nil
+      end
+    else
+      layout.to_sym
+    end
+  end
+
   # QUESTION is this method still necessary?
   def resolve_imagesdir doc
     if (imagesdir = doc.attr 'imagesdir').nil_or_empty? || (imagesdir = imagesdir.chomp '/') == '.'