[clutter] Support multiple pointers in ClutterDragAction.

[Emmanuele Bassi <ebassi src gnome org>]

commit 2528ad8cb8daf56f63f72ff8f413b5b8d3aea094
Author: Peter Ward <peteraward gmail com>
Date:   Tue Jun 21 23:17:51 2011 +1000

    Support multiple pointers in ClutterDragAction.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=653066

 clutter/clutter-drag-action.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/clutter/clutter-drag-action.c b/clutter/clutter-drag-action.c
index 05a6e03..c8302be 100644
--- a/clutter/clutter-drag-action.c
+++ b/clutter/clutter-drag-action.c
@@ -78,6 +78,7 @@ struct _ClutterDragActionPrivate
   ClutterActor *drag_handle;
   ClutterDragAxis drag_axis;
 
+  ClutterInputDevice *device;
   gulong button_press_id;
   gulong capture_id;
 
@@ -290,6 +291,9 @@ on_captured_event (ClutterActor      *stage,
   if (!priv->in_drag)
     return FALSE;
 
+  if (clutter_event_get_device (event) != priv->device)
+    return FALSE;
+
   switch (clutter_event_type (event))
     {
     case CLUTTER_MOTION:
@@ -344,6 +348,8 @@ on_button_press (ClutterActor      *actor,
   clutter_event_get_coords (event, &priv->press_x, &priv->press_y);
   priv->press_state = clutter_event_get_state (event);
 
+  priv->device = clutter_event_get_device (event);
+
   priv->last_motion_x = priv->press_x;
   priv->last_motion_y = priv->press_y;