Fixed a bug when dragging a plot into the active ViewFrame.

system/plots.py

@@ -84,6 +84,7 @@ class ViewFrame (gtk.Frame):
     def focus(self):
         """Gets focus and ensures that no other window is in focus."""
         if self.focused:
+            self.emit('focus-changed', self, True)
             return self
 
         for frame in self.view_frames:
@@ -123,7 +124,8 @@ class ViewFrame (gtk.Frame):
         if self._button_event:
             self._view.disconnect(self._button_event)
 
-        self._button_event = view.connect("button-press-event", self.on_button_press_event)
+        self._button_event = view.connect("button-press-event", 
+                                          self.on_button_press_event)
 
         # remove old view, set new view
         self._view.hide()
@@ -143,7 +145,8 @@ class ViewFrame (gtk.Frame):
         if not self.focused:
             self.focus()
             
-    def on_drag_data_received(self, widget, drag_context, x, y, selection, info, timestamp):
+    def on_drag_data_received(self, widget, drag_context, x, y, 
+                              selection, info, timestamp):
         treestore, path = selection.tree_get_row_drag_data()
         iter = treestore.get_iter(path)
         obj  = treestore.get_value(iter,2)
@@ -294,6 +297,7 @@ class EmptyView (Plot):
 class NavToolbar(NavigationToolbar2):
     toolitems = (('Select', 'Select within rectangle', 'zoom_to_rect.png',
                   'select'),) + NavigationToolbar2.toolitems
+
     def __init__(self, *args):
         NavigationToolbar2.__init__(self, *args)
         self._select_callback = None