[fix] video slider not working on preview screen

src/main.rs

@@ -1722,6 +1722,11 @@ impl cosmic::Application for App {
                     .on_press(Message::Present(presenter::Message::PlayPauseVideo))
             },
         );
+        let video_position = if let Some(video) = &self.presenter.preview_video {
+            video.position().as_secs_f64()
+        } else {
+            0.0
+        };
 
         let slide_preview = column![
             Space::new().height(Length::Fill),
@@ -1732,7 +1737,7 @@ impl cosmic::Application for App {
                 row![
                     video_button_icon,
                     Container::new(
-                        slider(0.0..=video_range, self.presenter.video_position, |pos| {
+                        slider(0.0..=video_range, video_position, |pos| {
                             Message::Present(presenter::Message::VideoPos(pos))
                         })
                         .step(0.1)

src/ui/presenter.rs

@@ -409,6 +409,14 @@ impl Presenter {
                         Err(e) => error!("Problem changing video position: {e}"),
                     }
                 }
+                if let Some(video) = &mut self.presentation_video {
+                    let position =
+                        Position::Time(std::time::Duration::from_secs_f64(position));
+                    match video.seek(position, false) {
+                        Ok(()) => debug!("Video position changed: {:?}", position),
+                        Err(e) => error!("Problem changing video position: {e}"),
+                    }
+                }
             }
             Message::VideoFrame => {
                 if let Some(video) = &self.preview_video