duerst	2018-11-25 19:12:45 +0900 (Sun, 25 Nov 2018)

  New Revision: 65971

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65971

  Log:
    deal with ONIGENC_CASE_IS_TITLECASE flag on lowercase characters
    
    In the function onigenc_unicode_case_map() in enc/unicode.c, deal
    with the case that the ONIGENC_CASE_IS_TITLECASE flag is set on
    lowercase characters. This is in preparation for Georgian Mtavruli,
    which are uppercase but not titlecase, in Unicode 11.0.0.

  Modified files:
    trunk/enc/unicode.c
Index: enc/unicode.c
===================================================================
--- enc/unicode.c	(revision 65970)
+++ enc/unicode.c	(revision 65971)
@@ -772,10 +772,15 @@ SpecialsCopy: https://github.com/ruby/ruby/blob/trunk/enc/unicode.c#L772
 	  }
 	}
       }
-      else if ((folded = onigenc_unicode_unfold1_lookup(code)) != 0  /* data about character found in CaseUnfold_11_Table */
-	  && flags & OnigCaseFoldFlags(folded->n)) { /* needs and data availability match */
-	MODIFIED;
-	code = folded->code[(flags & OnigCaseFoldFlags(folded->n) & ONIGENC_CASE_TITLECASE) ? 1 : 0];
+      else if ((folded = onigenc_unicode_unfold1_lookup(code)) != 0) { /* data about character found in CaseUnfold_11_Table */
+	if ((flags & ONIGENC_CASE_TITLECASE)                                 /* Titlecase needed, */
+	    && (OnigCaseFoldFlags(folded->n) & ONIGENC_CASE_IS_TITLECASE)) { /* but already Titlecase */
+	  /* already Titlecase, no changes needed */
+	}
+	else if (flags & OnigCaseFoldFlags(folded->n)) { /* needs and data availability match */
+	  MODIFIED;
+	  code = folded->code[(flags & OnigCaseFoldFlags(folded->n) & ONIGENC_CASE_TITLECASE) ? 1 : 0];
+	}
       }
     }
     to += ONIGENC_CODE_TO_MBC(enc, code, to);

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