Rename activate signal in cell renderers to 'clicked'

src/sugar/graphics/icon.py

@@ -923,7 +923,7 @@ class CellRendererIcon(gtk.GenericCellRenderer):
     __gtype_name__ = 'SugarCellRendererIcon'
 
     __gsignals__ = {
-        'activate': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, [object])
+        'clicked': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, [object])
     }
 
     def __init__(self, tree_view):

src/sugar/graphics/palette.py

@@ -1234,7 +1234,7 @@ class CellRendererInvoker(Invoker):
             tree_view = self._tree_view
             path, column_, x_, y_ = tree_view.get_path_at_pos(int(event.x),
                                                               int(event.y))
-            self._cell_renderer.emit('activate', path)
+            self._cell_renderer.emit('clicked', path)
             # So the treeview receives it and knows a drag isn't going on
             return False
         if event.button == 3 and self._point_in_cell_renderer(event.x, event.y):