Fix when passing a pixel-size for the icon when not using the constructor

sugar/graphics/icon.py

@@ -309,7 +309,10 @@ class Icon(gtk.Image):
         if self._buffer.file_name != self.props.file:
             self._buffer.file_name = self.props.file
 
-        width, height = gtk.icon_size_lookup(self.props.icon_size)
+        if self.props.pixel_size == -1:    
+            width, height = gtk.icon_size_lookup(self.props.icon_size)
+        else:
+            width = height = self.props.pixel_size 
         if self._buffer.width != width or self._buffer.height != height:
             self._buffer.width = width
             self._buffer.height = height
@@ -323,12 +326,6 @@ class Icon(gtk.Image):
     def _file_changed_cb(self, image, pspec):
         self._buffer.file_name = self.props.file
 
-    def _update_buffer_size(self):
-        width, height = gtk.icon_size_lookup(self.props.icon_size)
-
-        self._buffer.width = width
-        self._buffer.height = height
-
     def do_size_request(self, requisition):
         self._sync_image_properties()
         surface = self._buffer.get_surface()