public void set_background_pattern (Pattern? pattern)
Warning: set_background_pattern is deprecated since "3.22".
Sets the background of this.
Don't use this function
A background of null means that the window won't have any background. On the X11 backend it's also possible
to inherit the background from the parent window using
The windowing system will normally fill a window with its background when the window is obscured then exposed.
a pattern to use, or null