feat: less bad installations

rust/src/download_handler.rs

@@ -23,6 +23,7 @@ impl DownloadHandler {
             .ok_or_else(|| anyhow!("Attempted to download a package without remote data"))?
             .clone();
         if self.set.contains(zip_path.to_string_lossy().as_ref()) {
+            // Todo when there is a clear cache button, it should clear the set
             Err(anyhow!("Already downloading"))
         } else {
             self.set.insert(zip_path.to_string_lossy().to_string());