just use the notify mechanism for time-pos

src/ui/window.rs

@@ -64,6 +64,7 @@ mod imp {
             mpv.observe_property(2, "pause").unwrap();
             mpv.observe_property(3, "playlist-pos").unwrap();
             mpv.observe_property(4, "idle-active").unwrap();
+            mpv.observe_property(5, "time-pos").unwrap();
 
             // "Useful to drain property changes before a new file is loaded."
             mpv.add_hook(0, "on_before_start_file", 0).unwrap();
@@ -147,6 +148,11 @@ mod imp {
                                     window.notify("idle-active");
                                 }
 
+                                5 => {
+                                    assert_eq!(event.name, "time-pos");
+                                    window.notify("time-pos");
+                                }
+
                                 _ => unreachable!(),
                             },
 
@@ -245,19 +251,6 @@ mod imp {
                     .await
                     .expect("could not register name in session bus");
             });
-
-            // notify of new time-pos every 100 ms
-            glib::source::timeout_add_local(std::time::Duration::from_millis(100), {
-                let window = self.obj().downgrade();
-                move || {
-                    let window = match window.upgrade() {
-                        None => return glib::ControlFlow::Break,
-                        Some(window) => window,
-                    };
-                    window.notify("time-pos");
-                    glib::ControlFlow::Continue
-                }
-            });
         }
     }