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These functions let applications set desktop backgrounds.
The underlying portal is org.freedesktop.portal.Wallpaper.
void xdp_portal_set_wallpaper (XdpPortal *portal,XdpParent *parent,const char *uri,XdpWallpaperFlags flags,GCancellable *cancellable,GAsyncReadyCallback callback,gpointer data);
Sets a desktop background image, given by a uri.
| portal | ||
| parent | parent window information | |
| uri | the URI to use | |
| flags | options for this call | |
| cancellable | optional GCancellable. | [nullable] | 
| callback | a callback to call when the request is done. | [scope async] | 
| data | data to pass to  | [closure] | 
gboolean xdp_portal_set_wallpaper_finish (XdpPortal *portal,GAsyncResult *result,GError **error);
Finishes the open-uri request, and returns the result in the form of a boolean.