Sets the background of @window.
A background of %NULL means that the window will inherit its background from its parent window.
The windowing system will normally fill a window with its background when the window is obscured then exposed.
a pattern to use, or %NULL
See Implementation
Sets the background of @window.
A background of %NULL means that the window will inherit its background from its parent window.
The windowing system will normally fill a window with its background when the window is obscured then exposed.