When using this Xlib function to set a new background pixmap, how does the old one get freed? If I am setting the root window's background pixmap, I don't know how I can get the XID of the old one. If it is a window I created, I can cache it but that seems overkill if I'm just wanting to discard the old one. Can someone direct me to how I am supposed to free the old background pixmap? Thanks.
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