Fix post-trim for the raw tag

The added test did not pass before this commit.

lib/liquid/tags/raw.rb

@@ -16,7 +16,10 @@ module Liquid
       while (token = tokens.shift)
         if token =~ FullTokenPossiblyInvalid
           @body << Regexp.last_match(1) if Regexp.last_match(1) != ""
-          return if block_delimiter == Regexp.last_match(2)
+          if block_delimiter == Regexp.last_match(2)
+            @parse_context.trim_whitespace = (token[-3] == WhitespaceControl)
+            return
+          end
         end
         @body << token unless token.empty?
       end

test/integration/tags/raw_tag_test.rb

@@ -14,6 +14,10 @@ class RawTagTest < Minitest::Test
     assert_template_result('{{ test }}', '{% raw %}{{ test }}{% endraw %}')
   end
 
+  def test_post_trim
+    assert_template_result('hi', "{% raw %}hi{% endraw -%}\n")
+  end
+
   def test_open_tag_in_raw
     assert_template_result(' Foobar {% invalid ', '{% raw %} Foobar {% invalid {% endraw %}')
     assert_template_result(' Foobar invalid %} ', '{% raw %} Foobar invalid %} {% endraw %}')