[gtk+] treeview: Add back a check to ignore buttons > 3

[Carlos Garnacho <carlosg src gnome org>]

commit 0bb955b30ea3d46f8c7de6b0f2dd1f3b13efa9ba
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Jul 22 13:03:22 2014 +0200

    treeview: Add back a check to ignore buttons > 3
    
    The removal was not intentional, and still needed as the GtkGestureMultiPress
    will work for any button unless told to lock on a single specific one.

 gtk/gtktreeview.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtktreeview.c b/gtk/gtktreeview.c
index e648ffc..5e24060 100644
--- a/gtk/gtktreeview.c
+++ b/gtk/gtktreeview.c
@@ -3078,13 +3078,19 @@ gtk_tree_view_multipress_gesture_pressed (GtkGestureMultiPress *gesture,
                        "vertical-separator", &vertical_separator,
                        "horizontal-separator", &horizontal_separator,
                        NULL);
+  button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
+
+  if (button > 3)
+    {
+      gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_DENIED);
+      return;
+    }
 
   /* Because grab_focus can cause reentrancy, we delay grab_focus until after
    * we're done handling the button press.
    */
   gtk_tree_view_convert_widget_to_bin_window_coords (tree_view, x, y,
                                                      &bin_x, &bin_y);
-  button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
   gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
 
   if (n_press > 1)