draw_rectangle
Description:
Draws an axis-aligned rectangle in user space coordinates with the specified `PangoRenderer`.
This should be called while this is already active. Use [method@Pango.Renderer.activate] to activate a renderer.
Parameters:
| this | a `PangoRenderer` | 
| part | type of object this rectangle is part of | 
| x | X position at which to draw rectangle, in user space coordinates in Pango units | 
| y | Y position at which to draw rectangle, in user space coordinates in Pango units | 
| width | width of rectangle in Pango units | 
| height | height of rectangle in Pango units |