[gtk+] Fix backward search bug exposed by the unit test

[Paolo Borelli <pborelli src gnome org>]

commit 42910194a93bd4c36cd5d1e59231d7253e77d8a0
Author: Paolo Borelli <pborelli gnome org>
Date:   Sun Oct 31 13:52:06 2010 +0100

    Fix backward search bug exposed by the unit test
    
    When searching with multiple lines first_line_start/end were initialized
    to the last line start/end iters

 gtk/gtktextiter.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtktextiter.c b/gtk/gtktextiter.c
index 13a4e37..380778f 100644
--- a/gtk/gtktextiter.c
+++ b/gtk/gtktextiter.c
@@ -4803,6 +4803,8 @@ lines_window_init (LinesWindow       *win,
         }
 
       win->lines[i] = line_text;
+      win->first_line_start = line_start;
+      win->first_line_end = line_end;
 
       line_end = line_start;
       gtk_text_iter_backward_line (&line_start);