do not clear playlists content, make idle notifications take care of it

src/actions.cpp

@@ -1062,10 +1062,7 @@ void Add::Run()
 		Statusbar() << "Adding...";
 		wFooter->refresh();
 		if (myScreen == myPlaylistEditor)
-		{
 			Mpd.AddToPlaylist(myPlaylistEditor->Playlists->current().value(), path);
-			myPlaylistEditor->Content->clear(); // make it refetch content of playlist
-		}
 		else
 		{
 			const char lastfm_url[] = "lastfm://";

src/status.cpp

@@ -305,8 +305,6 @@ void NcmpcppStatusChanged(MPD::Connection *, MPD::StatusChanges changed, void *)
 			else
 				myLibrary->Tags->clear();
 		}
-		if (myPlaylistEditor->Main())
-			myPlaylistEditor->Content->clear();
 		changed.DBUpdating = 1;
 	}
 	if (changed.PlayerState)