[pango] Fix grapheme boundaries of surrogates and unassigned default ignorables

[Behdad Esfahbod <behdad src gnome org>]

commit 816200e8b3221f630f424c167a3ee8ea4ebc4ba1
Author: Behdad Esfahbod <behdad behdad org>
Date:   Sun Dec 2 18:05:35 2012 +0200

    Fix grapheme boundaries of surrogates and unassigned default ignorables

 pango/break.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/pango/break.c b/pango/break.c
index e8a97c1..dd55eda 100644
--- a/pango/break.c
+++ b/pango/break.c
@@ -665,9 +665,19 @@ pango_default_break (const gchar   *text,
 	  case G_UNICODE_CONTROL:
 	  case G_UNICODE_LINE_SEPARATOR:
 	  case G_UNICODE_PARAGRAPH_SEPARATOR:
+	  case G_UNICODE_SURROGATE:
 	    GB_type = GB_ControlCRLF;
 	    break;
 
+	  case G_UNICODE_UNASSIGNED:
+	    /* Unassigned default ignorables */
+	    if ((wc >= 0xFFF0 && wc <= 0xFFF8) ||
+		(wc >= 0xE0000 && wc <= 0xE0FFF))
+	      {
+		GB_type = GB_ControlCRLF;
+		break;
+	      }
+
 	  case G_UNICODE_OTHER_LETTER:
 	    if (makes_hangul_syllable)
 	      GB_type = GB_InHangulSyllable;