[gtk+] TextView: Be const-correct when passing a pointer

[Daniel Boles <dboles src gnome org>]

commit b00b7c3b0e852f1027875cd40aba8b406700dbac
Author: Daniel Boles <dboles src gnome org>
Date:   Mon Mar 27 19:14:38 2017 +0100

    TextView: Be const-correct when passing a pointer
    
    The TextIter is passed by pointer for efficiency. We neither need to
    modify it, nor should we leave it possible to accidentally do so. So,
    it should be passed as a pointer-to-const.

 gtk/gtktextview.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtktextview.c b/gtk/gtktextview.c
index a8ad5c2..03fdf97 100644
--- a/gtk/gtktextview.c
+++ b/gtk/gtktextview.c
@@ -6344,7 +6344,7 @@ move_cursor (GtkTextView       *text_view,
 }
 
 static gboolean
-iter_line_is_rtl (GtkTextIter *iter)
+iter_line_is_rtl (const GtkTextIter *iter)
 {
   GtkTextIter start, end;
   char *text;