feat(wallpaper): custom background images and folders

page/Cargo.toml

@@ -11,3 +11,4 @@ libcosmic = { workspace = true }
 generator = "0.7.4"
 downcast-rs = "1.2.0"
 once_cell = "1.17.2"
+url = "2.5.0"

page/src/lib.rs

@@ -44,6 +44,11 @@ pub trait Page<Message: 'static>: Downcast {
         None
     }
 
+    /// Response from a file chooser dialog request.
+    fn file_chooser(&mut self, _selected: Vec<url::Url>) -> Command<Message> {
+        Command::none()
+    }
+
     #[must_use]
     #[allow(unused)]
     fn load(&self, page: crate::Entity) -> Option<crate::Task<Message>> {