backport fix for #1735 and #1949

Author: mojavelinux

lib/asciidoctor/pdf/ext/prawn/extensions.rb

@@ -76,6 +76,27 @@ def effective_page_height
         reference_bounds.height
       end
 
+      # workaround for https://github.com/prawnpdf/prawn/issues/1121
+      def generate_margin_box
+        page_w, page_h = (page = state.page).dimensions.slice 2, 2
+        page_m = page.margins
+        prev_margin_box, @margin_box = @margin_box, (::Prawn::Document::BoundingBox.new self, nil, [page_m[:left], page_h - page_m[:top]], width: page_w - page_m[:left] - page_m[:right], height: page_h - page_m[:top] - page_m[:bottom])
+
+        # update bounding box if not flowing from the previous page
+        unless @bounding_box&.parent
+          prev_margin_box = @bounding_box
+          @bounding_box = @margin_box
+        end
+
+        # maintains indentation settings across page breaks
+        if prev_margin_box
+          @margin_box.add_left_padding prev_margin_box.total_left_padding
+          @margin_box.add_right_padding prev_margin_box.total_right_padding
+        end
+
+        nil
+      end
+
       # Set the margins for the current page.
       #
       def set_page_margin margin

spec/table_spec.rb

@@ -1094,6 +1094,45 @@
       (expect a_texts[0][:y]).to eql b_texts[0][:y]
       (expect b_texts[0][:x]).to eql b_texts[1][:x]
     end
+
+    it 'should preserve left margin on page that follows page containing a table with an AsciiDoc table cell' do
+      pdf = to_pdf <<~EOS, analyze: true
+      == Section Title
+
+      [%hardbreaks]
+      #{(['filler'] * 20).join ?\n}
+
+      [cols=2*]
+      |===
+      |filler
+      a| Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna al abcde aaaaaaaaaa bbbbb
+
+      ____
+      Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et
+      Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+      ____
+      |===
+
+      terms::
+      Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et doloreata.
+
+      nested term:::
+      Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore. +
+      Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore. +
+      Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et fin.
+
+      .list title
+      * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore.
+      EOS
+
+      first_page_text = pdf.text.select {|it| it[:page_number] == 1 }
+      second_page_text = pdf.text.select {|it| it[:page_number] == 2 }
+      (expect second_page_text[0][:string]).to end_with ' et fin.'
+      (expect second_page_text[0][:x]).to be > 48.24
+      (expect second_page_text[0][:x]).to eql first_page_text.last[:x]
+      (expect second_page_text[1][:string]).to eql 'list title'
+      (expect second_page_text[1][:x]).to eql 48.24
+    end
   end
 
   context 'Verse table cell' do