Fix chars.reverse for multibyte decomposed strings

[#597 state:committed]

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>

activesupport/lib/active_support/multibyte/chars.rb

@@ -321,7 +321,7 @@ module ActiveSupport #:nodoc:
       # Example:
       #   'Café'.mb_chars.reverse.to_s #=> 'éfaC'
       def reverse
-        chars(self.class.u_unpack(@wrapped_string).reverse.pack('U*'))
+        chars(self.class.g_unpack(@wrapped_string).reverse.flatten.pack('U*'))
       end
 
       # Implements Unicode-aware slice with codepoints. Slicing on one point returns the codepoints for that

activesupport/test/multibyte_chars_test.rb

@@ -384,6 +384,17 @@ class MultibyteCharsUTF8BehaviourTest < Test::Unit::TestCase
     assert_equal 'わちにこ', @chars.reverse
   end
 
+  def test_reverse_should_work_with_normalized_strings
+    str = 'bös'
+    reversed_str = 'söb'
+    assert_equal chars(reversed_str).normalize(:kc), chars(str).normalize(:kc).reverse
+    assert_equal chars(reversed_str).normalize(:c), chars(str).normalize(:c).reverse
+    assert_equal chars(reversed_str).normalize(:d), chars(str).normalize(:d).reverse
+    assert_equal chars(reversed_str).normalize(:kd), chars(str).normalize(:kd).reverse
+    assert_equal chars(reversed_str).decompose, chars(str).decompose.reverse
+    assert_equal chars(reversed_str).compose, chars(str).compose.reverse
+  end
+
   def test_slice_should_take_character_offsets
     assert_equal nil, ''.mb_chars.slice(0)
     assert_equal 'こ', @chars.slice(0)