diff -up emacs-23.1/src/gtkutil.c.scroll emacs-23.1/src/gtkutil.c
--- emacs-23.1/src/gtkutil.c.scroll	2009-06-21 06:38:15.000000000 +0200
+++ emacs-23.1/src/gtkutil.c	2009-12-02 17:10:08.000000000 +0100
@@ -3401,6 +3401,38 @@ xg_set_toolkit_scroll_bar_thumb (bar, po
     }
 }
 
+/* Return non-zero if EVENT is for a scroll bar in frame F.
+   When the same X window is used for several Gtk+ widgets, we cannot
+   say for sure based on the X window alone if an event is for the
+   frame.  This function does additional checks.
+
+   Return non-zero if the event is for a scroll bar, zero otherwise.  */
+
+int
+xg_event_is_for_scrollbar (f, event)
+     FRAME_PTR f;
+     XEvent *event;
+{
+  int retval = 0;
+
+  if (f && event->type == ButtonPress)
+    {
+      /* Check if press occurred outside the edit widget.  */
+      GdkDisplay *gdpy = gdk_x11_lookup_xdisplay (FRAME_X_DISPLAY (f));
+      retval = gdk_display_get_window_at_pointer (gdpy, NULL, NULL)
+        != f->output_data.x->edit_widget->window;
+    }
+  else if (f && (event->type != ButtonRelease || event->type != MotionNotify))
+    {
+      /* If we are releasing or moving the scroll bar, it has the grab.  */
+      retval = gtk_grab_get_current () != 0
+        && gtk_grab_get_current () != f->output_data.x->edit_widget;
+    }
+
+  return retval;
+}
+
+
 
 /***********************************************************************
                       Tool bar functions
diff -up emacs-23.1/src/gtkutil.h.scroll emacs-23.1/src/gtkutil.h
--- emacs-23.1/src/gtkutil.h.scroll	2009-06-21 06:38:15.000000000 +0200
+++ emacs-23.1/src/gtkutil.h	2009-12-02 17:10:08.000000000 +0100
@@ -180,6 +180,8 @@ extern void xg_set_toolkit_scroll_bar_th
                                                  int position,
                                                  int whole));
 
+extern int xg_event_is_for_scrollbar P_ ((FRAME_PTR f, XEvent *event));
+
 
 extern void update_frame_tool_bar P_ ((FRAME_PTR f));
 extern void free_frame_tool_bar P_ ((FRAME_PTR f));
diff -up emacs-23.1/src/xterm.c.scroll emacs-23.1/src/xterm.c
--- emacs-23.1/src/xterm.c.scroll	2009-06-21 06:38:20.000000000 +0200
+++ emacs-23.1/src/xterm.c	2009-12-02 17:13:24.000000000 +0100
@@ -6743,6 +6743,12 @@ handle_one_xevent (dpyinfo, eventp, fini
             clear_mouse_face (dpyinfo);
           }
 
+
+#ifdef USE_GTK
+        if (f && xg_event_is_for_scrollbar (f, &event))
+          f = 0;
+#endif
+
         if (f)
           {
 
@@ -6899,6 +6905,11 @@ handle_one_xevent (dpyinfo, eventp, fini
         else
           f = x_window_to_frame (dpyinfo, event.xbutton.window);
 
+#ifdef USE_GTK
+        if (f && xg_event_is_for_scrollbar (f, &event))
+          f = 0;
+#endif
+
         if (f)
           {
             /* Is this in the tool-bar?  */