[gtkmm] Headerbar demo: Arrow icons have been renamed

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 2379b5ace43bd1bd12e4cb8d8fd30360348756f2
Author: Kjell Ahlstedt <kjell ahlstedt bredband net>
Date:   Fri Sep 19 14:05:25 2014 +0200

    Headerbar demo: Arrow icons have been renamed
    
    * demos/gtk-demo/example_headerbar.cc: The named icons
    pan-[left|right]-symbolic have been renamed to pan-[start|end]-symbolic.

 demos/gtk-demo/example_headerbar.cc |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/demos/gtk-demo/example_headerbar.cc b/demos/gtk-demo/example_headerbar.cc
index 2c7ce6a..451a0c8 100644
--- a/demos/gtk-demo/example_headerbar.cc
+++ b/demos/gtk-demo/example_headerbar.cc
@@ -11,7 +11,7 @@
 
 #include "gtkmm.h"
 
-// 2014-05-21: The pan-[up,down,left,right]-symbolic icons are new.
+// 2014-09-19: The pan-[up,down,start,end]-symbolic icons are new.
 // See https://bugzilla.gnome.org/show_bug.cgi?id=729565
 // If they are not available in your selected icon theme, perhaps you can
 // use the go-[up,down,previous,next]-symbolic icons.
@@ -94,8 +94,8 @@ void Example_HeaderBar::configure_arrow_buttons()
   m_arrow_buttons_box.get_style_context()->add_class("linked");
 
 #if USE_PAN_ICON_NAMES
-  m_left_arrow_button.set_image_from_icon_name("pan-left-symbolic", Gtk::ICON_SIZE_BUTTON, true);
-  m_right_arrow_button.set_image_from_icon_name("pan-right-symbolic", Gtk::ICON_SIZE_BUTTON, true);
+  m_left_arrow_button.set_image_from_icon_name("pan-start-symbolic", Gtk::ICON_SIZE_BUTTON, true);
+  m_right_arrow_button.set_image_from_icon_name("pan-end-symbolic", Gtk::ICON_SIZE_BUTTON, true);
 #else
   m_left_arrow_button.set_image_from_icon_name("go-previous-symbolic", Gtk::ICON_SIZE_BUTTON, true);
   m_right_arrow_button.set_image_from_icon_name("go-next-symbolic", Gtk::ICON_SIZE_BUTTON, true);