[gtk+] textiter: fix bug in _gtk_text_btree_get_iter_at_last_toggle()

[Sébastien Wilmet <swilmet src gnome org>]

commit b23eabbd642a5d4c46a173d5324a76f4cb63c9f7
Author: Sébastien Wilmet <sebastien wilmet uclouvain be>
Date:   Tue Sep 22 14:40:57 2015 +0200

    textiter: fix bug in _gtk_text_btree_get_iter_at_last_toggle()
    
    If the last tag toggle is the end iter, the function returned the wrong
    tag toggle.
    
    This resulted in some bugs where the view wasn't relayout/redrawn
    correctly.
    
    The function also always returned TRUE, probably because the return
    value is used nowhere. But for consistency with
    _gtk_text_btree_get_iter_at_first_toggle(), it's better to keep the
    return value, and also because otherwise the function would be wrong (it
    doesn't always return a tag toggle, if there is none).
    
    https://bugzilla.gnome.org/show_bug.cgi?id=755413

 gtk/gtktextiter.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtktextiter.c b/gtk/gtktextiter.c
index c600b83..6b31c64 100644
--- a/gtk/gtktextiter.c
+++ b/gtk/gtktextiter.c
@@ -5648,14 +5648,21 @@ _gtk_text_btree_get_iter_at_last_toggle  (GtkTextBTree   *tree,
                                           GtkTextIter    *iter,
                                           GtkTextTag     *tag)
 {
+  gboolean found;
+
   g_return_val_if_fail (iter != NULL, FALSE);
   g_return_val_if_fail (tree != NULL, FALSE);
 
   _gtk_text_btree_get_end_iter (tree, iter);
-  gtk_text_iter_backward_to_tag_toggle (iter, tag);
+
+  if (gtk_text_iter_toggles_tag (iter, tag))
+    found = TRUE;
+  else
+    found = gtk_text_iter_backward_to_tag_toggle (iter, tag);
+
   check_invariants (iter);
   
-  return TRUE;
+  return found;
 }
 
 gboolean