Pass GioFiles from FileChooser instead of URIs

Otherwise they are converted back to GioFile to check their existance and back again to URI which is unefficient. This change avoids doing that.

clapper_src/dialogs.js

@@ -52,18 +52,17 @@ class ClapperFileChooser extends Gtk.FileChooserNative
             let playlist = [];
 
             while((file = files.get_item(index))) {
-                let uri = file.get_uri();
                 let filename = file.get_basename();
                 let [type, isUncertain] = Gio.content_type_guess(filename, null);
 
                 if(this.subsMimes.includes(type)) {
-                    subs = uri;
+                    subs = file;
                     files.remove(index);
 
                     continue;
                 }
 
-                playlist.push(uri);
+                playlist.push(file);
                 index++;
             }
 

clapper_src/player.js

@@ -156,8 +156,12 @@ class ClapperPlayer extends PlayerBase
         return this._playlist;
     }
 
-    set_subtitles(uri)
+    set_subtitles(source)
     {
+        let uri = (source.get_uri)
+            ? source.get_uri()
+            : source;
+
         this.set_subtitle_uri(uri);
         this.set_subtitle_track_enabled(true);