[pango] Fix pango_glyph_item_iter_prev() around last cluster

[Behdad Esfahbod <behdad src gnome org>]

commit 3463c0d118da131b01179fc432e04a4400fc767b
Author: Behdad Esfahbod <behdad behdad org>
Date:   Sat Aug 8 16:12:24 2015 +0200

    Fix pango_glyph_item_iter_prev() around last cluster
    
    It was combining the last two clusters.  Ouch!
    
    Test added already.  Passes now.

 pango/pango-glyph-item.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/pango/pango-glyph-item.c b/pango/pango-glyph-item.c
index 1d4ff8e..6954ed8 100644
--- a/pango/pango-glyph-item.c
+++ b/pango/pango-glyph-item.c
@@ -359,8 +359,6 @@ pango_glyph_item_iter_prev_cluster (PangoGlyphItemIter *iter)
       cluster = glyphs->log_clusters[glyph_index - 1];
       while (TRUE)
        {
-         glyph_index--;
-
          if (glyph_index == 0)
            {
              iter->start_index = item->offset;
@@ -368,6 +366,8 @@ pango_glyph_item_iter_prev_cluster (PangoGlyphItemIter *iter)
              break;
            }
 
+         glyph_index--;
+
          if (glyphs->log_clusters[glyph_index] != cluster)
            {
              glyph_index++;
@@ -383,8 +383,6 @@ pango_glyph_item_iter_prev_cluster (PangoGlyphItemIter *iter)
       cluster = glyphs->log_clusters[glyph_index + 1];
       while (TRUE)
        {
-         glyph_index++;
-
          if (glyph_index == glyphs->num_glyphs - 1)
            {
              iter->start_index = item->offset;
@@ -392,6 +390,8 @@ pango_glyph_item_iter_prev_cluster (PangoGlyphItemIter *iter)
              break;
            }
 
+         glyph_index++;
+
          if (glyphs->log_clusters[glyph_index] != cluster)
            {
              glyph_index--;