[pango: 4/6] Update Word Boundary to Unicode 11

[Matthias Clasen <matthiasc src gnome org>]

commit f1d3992379134812d81930c526ff1021d36ea7a5
Author: Peng Wu <alexepico gmail com>
Date:   Thu Aug 16 14:18:20 2018 +0800

    Update Word Boundary to Unicode 11

 pango/break.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
---
diff --git a/pango/break.c b/pango/break.c
index c50c18eb..136d5006 100644
--- a/pango/break.c
+++ b/pango/break.c
@@ -218,6 +218,7 @@ pango_default_break (const gchar   *text,
     WB_ExtendNumLet,
     WB_RI_Odd,
     WB_RI_Even,
+    WB_WSegSpace,
   } WordBreakType;
   WordBreakType prev_prev_WB_type = WB_Other, prev_WB_type = WB_Other;
   gint prev_WB_i = -1;
@@ -660,7 +661,14 @@ pango_default_break (const gchar   *text,
                  break;
                }
 
-           /* Grapheme Cluster Boundary Rules */
+           if (WB_type == WB_Other)
+             {
+               if (type == G_UNICODE_SPACE_SEPARATOR &&
+                   break_type != G_UNICODE_BREAK_NON_BREAKING_GLUE)
+                 WB_type = WB_WSegSpace;
+             }
+
+           /* Word Cluster Boundary Rules */
 
            /* We apply Rules WB1 and WB2 at the end of the function */
 
@@ -676,6 +684,11 @@ pango_default_break (const gchar   *text,
              }
            else if (WB_type == WB_NewlineCRLF)
              is_word_boundary = TRUE; /* Rule WB3b */
+           else if (prev_wc == 0x200D && is_Extended_Pictographic)
+             is_word_boundary = FALSE; /* Rule WB3c */
+           else if (prev_WB_type == WB_WSegSpace &&
+                    WB_type == WB_WSegSpace && prev_WB_i + 1 == i)
+             is_word_boundary = FALSE; /* Rule WB3d */
            else if (WB_type == WB_ExtendFormat)
              is_word_boundary = FALSE; /* Rules WB4? */
            else if ((prev_WB_type == WB_ALetter  ||