part_changed

Informs Pango that the way that the rendering is done for part has changed.

This should be called if the rendering changes in a way that would prevent multiple pieces being joined together into one drawing call. For instance, if a subclass of `PangoRenderer` was to add a stipple option for drawing underlines, it needs to call

``` pango_renderer_part_changed (render, PANGO_RENDER_PART_UNDERLINE); ```

When the stipple changes or underlines with different stipples might be joined together. Pango automatically calls this for changes to colors. (See [method@Pango.Renderer.set_color])

Parameters:

this	a `PangoRenderer`
part	the part for which rendering has changed.