Avoid block parser warning in SmartyPants (#6565)

Merge pull request 6565

lib/jekyll/converters/smartypants.rb

@@ -3,9 +3,14 @@
 class Kramdown::Parser::SmartyPants < Kramdown::Parser::Kramdown
   def initialize(source, options)
     super
-    @block_parsers = [:block_html]
+    @block_parsers = [:block_html, :content]
     @span_parsers =  [:smart_quotes, :html_entity, :typographic_syms, :span_html]
   end
+
+  def parse_content
+    add_text @src.scan(%r!\A.*\n!)
+  end
+  define_parser(:content, %r!\A!)
 end
 
 module Jekyll

test/test_filters.rb

@@ -100,6 +100,10 @@ class TestFilters < JekyllUnitTest
         assert_equal "“", @filter.smartify("&ldquo;")
       end
 
+      should "convert multiple lines" do
+        assert_equal "…\n…", @filter.smartify("...\n...")
+      end
+
       should "allow raw HTML passthrough" do
         assert_equal(
           "Span HTML is <em>not</em> escaped",
@@ -123,6 +127,12 @@ class TestFilters < JekyllUnitTest
           @filter.smartify(404)
         )
       end
+
+      should "not output any warnings" do
+        assert_empty(
+          capture_output { @filter.smartify("Test") }
+        )
+      end
     end
 
     should "sassify with simple string" do