nobu	2014-04-18 17:00:04 +0900 (Fri, 18 Apr 2014)

  New Revision: 45622

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=45622

  Log:
    string.c: don't clear coderange at expanding
    
    * string.c (rb_str_modify_expand): like as str_modify_keep_cr,
      don't clear coderange unless broken.

  Modified files:
    trunk/string.c
Index: string.c
===================================================================
--- string.c	(revision 45621)
+++ string.c	(revision 45622)
@@ -1500,7 +1500,10 @@ rb_str_modify_expand(VALUE str, long exp https://github.com/ruby/ruby/blob/trunk/string.c#L1500
 	    str_make_independent_expand(str, expand);
 	}
     }
-    ENC_CODERANGE_CLEAR(str);
+    if (ENC_CODERANGE(str) == ENC_CODERANGE_BROKEN) {
+	/* Force re-scan later */
+	ENC_CODERANGE_CLEAR(str);
+    }
 }
 
 /* As rb_str_modify(), but don't clear coderange */

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