Allow raw tag to be used with whitespace control

lib/liquid/tags/raw.rb

@@ -14,7 +14,7 @@ module Liquid
   # @liquid_syntax_keyword expression The expression to be output without being rendered.
   class Raw < Block
     Syntax = /\A\s*\z/
-    FullTokenPossiblyInvalid = /\A(.*)#{TagStart}\s*(\w+)\s*(.*)?#{TagEnd}\z/om
+    FullTokenPossiblyInvalid = /\A(.*)#{TagStart}#{WhitespaceControl}?\s*(\w+)\s*(.*)?#{WhitespaceControl}?#{TagEnd}\z/om
 
     def initialize(tag_name, markup, parse_context)
       super

test/integration/tags/raw_tag_test.rb

@@ -12,6 +12,7 @@ class RawTagTest < Minitest::Test
 
   def test_output_in_raw
     assert_template_result('{{ test }}', '{% raw %}{{ test }}{% endraw %}')
+    assert_template_result('{{ test }}', '{%- raw -%}{{ test }}{%- endraw -%}')
   end
 
   def test_open_tag_in_raw