[gtk+] Added "shift" modifier versions of keybings for GtkFileChooser "folder-up"/"folder-down" bindings.

[Tristan Van Berkom <tvb src gnome org>]

commit ddb4b3ebe2fca5eb5da6bc6a70549885df10faaf
Author: Tristan Van Berkom <tristan van berkom gmail com>
Date:   Sat Jan 29 20:06:25 2011 +0900

    Added "shift" modifier versions of keybings for GtkFileChooser "folder-up"/"folder-down" bindings.
    
    Also updated documentation, closes bug 322926

 gtk/gtkfilechooser.c        |   15 ++++++++++---
 gtk/gtkfilechooserdefault.c |   46 ++++++++++++++++++++++++++++---------------
 2 files changed, 41 insertions(+), 20 deletions(-)
---
diff --git a/gtk/gtkfilechooser.c b/gtk/gtkfilechooser.c
index 9243612..19071fe 100644
--- a/gtk/gtkfilechooser.c
+++ b/gtk/gtkfilechooser.c
@@ -222,18 +222,25 @@
  * 	      <row>
  * 		<entry>up-folder</entry>
  * 		<entry>
- * 		  <keycombo><keycap>Alt</keycap><keycap>Up</keycap></keycombo>
+ * 		  <keycombo><keycap>Alt</keycap><keycap>Up</keycap></keycombo>;
+ *                <keycombo><keycap>Alt</keycap><keycap>Shift</keycap><keycap>Up</keycap></keycombo>
  *                <footnote>
  * 		      Both the individual Up key and the numeric
  * 		      keypad's Up key are supported.
- * 		  </footnote>
- * 		  ;
+ * 		  </footnote>;
  * 		  <keycap>Backspace</keycap>
  * 		</entry>
  * 	      </row>
  * 	      <row>
  * 		<entry>down-folder</entry>
- * 		<entry><keycombo><keycap>Alt</keycap><keycap>Down</keycap></keycombo></entry>
+ * 		<entry>
+ *                <keycombo><keycap>Alt</keycap><keycap>Down</keycap></keycombo>;
+ *                <keycombo><keycap>Alt</keycap><keycap>Shift</keycap><keycap>Down</keycap></keycombo>
+ *                <footnote>
+ * 		      Both the individual Down key and the numeric
+ * 		      keypad's Down key are supported.
+ * 		  </footnote>
+ *              </entry>
  * 	      </row>
  * 	      <row>
  * 		<entry>home-folder</entry>
diff --git a/gtk/gtkfilechooserdefault.c b/gtk/gtkfilechooserdefault.c
index fc89dc9..57d0514 100644
--- a/gtk/gtkfilechooserdefault.c
+++ b/gtk/gtkfilechooserdefault.c
@@ -465,6 +465,22 @@ G_DEFINE_TYPE_WITH_CODE (GtkFileChooserDefault, _gtk_file_chooser_default, GTK_T
 			 G_IMPLEMENT_INTERFACE (GTK_TYPE_FILE_CHOOSER_EMBED,
 						gtk_file_chooser_embed_default_iface_init));						
 
+
+static void
+add_normal_and_shifted_binding (GtkBindingSet  *binding_set,
+				guint           keyval,
+				GdkModifierType modifiers,
+				const gchar    *signal_name)
+{
+  gtk_binding_entry_add_signal (binding_set,
+				keyval, modifiers,
+				signal_name, 0);
+
+  gtk_binding_entry_add_signal (binding_set,
+				keyval, modifiers | GDK_SHIFT_MASK,
+				signal_name, 0);
+}
+
 static void
 _gtk_file_chooser_default_class_init (GtkFileChooserDefaultClass *class)
 {
@@ -618,26 +634,24 @@ _gtk_file_chooser_default_class_init (GtkFileChooserDefaultClass *class)
 				"location-popup-on-paste",
 				0);
   gtk_binding_entry_add_signal (binding_set,
-				GDK_KEY_Up, GDK_MOD1_MASK,
-				"up-folder",
-				0);
-  gtk_binding_entry_add_signal (binding_set,
 		  		GDK_KEY_BackSpace, 0,
 				"up-folder",
 				0);
-  gtk_binding_entry_add_signal (binding_set,
-				GDK_KEY_KP_Up, GDK_MOD1_MASK,
-				"up-folder",
-				0);
 
-  gtk_binding_entry_add_signal (binding_set,
-				GDK_KEY_Down, GDK_MOD1_MASK,
-				"down-folder",
-				0);
-  gtk_binding_entry_add_signal (binding_set,
-				GDK_KEY_KP_Down, GDK_MOD1_MASK,
-				"down-folder",
-				0);
+  add_normal_and_shifted_binding (binding_set,
+				  GDK_KEY_Up, GDK_MOD1_MASK,
+				  "up-folder");
+
+  add_normal_and_shifted_binding (binding_set,
+				  GDK_KEY_KP_Up, GDK_MOD1_MASK,
+				  "up-folder");
+
+  add_normal_and_shifted_binding (binding_set,
+				  GDK_KEY_Down, GDK_MOD1_MASK,
+				  "down-folder");
+  add_normal_and_shifted_binding (binding_set,
+				  GDK_KEY_KP_Down, GDK_MOD1_MASK,
+				  "down-folder");
 
   gtk_binding_entry_add_signal (binding_set,
 				GDK_KEY_Home, GDK_MOD1_MASK,