Content streams must have balanced q/Q operators or some readers comp…

…lain

* evince crashes, acrobat displays an error dialog
* This was an issue on fresh content streams added to pages imported via
  a template
* Thanks to Omar Garcia for reporting

lib/prawn/document/internals.rb

@@ -97,14 +97,15 @@ def fresh_content_streams
           go_to_page i
           state.page.new_content_stream
           use_graphic_settings
+          save_graphics_state
         end
       end
 
       def finalize_all_page_contents
         (1..page_count).each do |i|
           go_to_page i
           repeaters.each { |r| r.run(i) }
-          restore_graphics_state if state.page.content.stream.strip[-1,1] != "Q"
+          restore_graphics_state
           state.page.finalize
         end
       end

spec/template_spec.rb

@@ -56,6 +56,22 @@
     streams.size.should == 2
   end
 
+  it "should have balance q/Q operators on all content streams" do
+    filename = "#{Prawn::BASEDIR}/data/pdfs/hexagon.pdf"
+
+    @pdf = Prawn::Document.new(:template => filename)
+    output = StringIO.new(@pdf.render)
+    hash = PDF::Hash.new(output)
+
+    streams = hash.values.select { |obj| obj.kind_of?(PDF::Reader::Stream) }
+
+    streams.each do |stream|
+      data = stream.unfiltered_data
+      data.scan("q").size.should == 1
+      data.scan("Q").size.should == 1
+    end
+  end
+
   it "should allow text to be added to a single page template" do
     filename = "#{Prawn::BASEDIR}/data/pdfs/hexagon.pdf"