fix/change_display_resolution, send switch display msg

Signed-off-by: dignow <linlong1265@gmail.com>

src/server/connection.rs

@@ -2142,6 +2142,12 @@ impl Connection {
                     });
                 }
             }
+
+            // Send display changed message.
+            // For compatibility with old versions ( < 1.2.4 ).
+            if let Some(msg_out) = video_service::make_display_changed_msg(self.display_idx, None) {
+                self.send(msg_out).await;
+            }
         }
     }