WIP only update display if dirty_flag is set

src/display.rs

@@ -88,6 +88,13 @@ impl EventHandler for MPDDisplay {
 
         if self.is_valid && self.is_initialized && self.poll_instant.elapsed() > POLL_TIME {
             self.poll_instant = Instant::now();
+            if !self.dirty_flag.is_none()
+                && self
+                    .dirty_flag
+                    .as_ref()
+                    .unwrap()
+                    .swap(false, std::sync::atomic::Ordering::Relaxed)
+            {
                 self.shared = MPDHandler::get_current_song_info(self.mpd_handler.clone().unwrap())
                     .map_or(None, |f| Some(f));
                 if let Some(shared) = &self.shared {
@@ -96,6 +103,7 @@ impl EventHandler for MPDDisplay {
                     }
                 }
             }
+        }
 
         Ok(())
     }