Default to sorting songs in media library by their display format instead of name

NEWS

@@ -1,7 +1,7 @@
 ncmpcpp-0.8.1 (????-??-??)
 * Setting 'colors_enabled' to 'no' no longer results in a crash.
 * Using '--quiet' command line argument no longer results in a crash.
-* If songs in media library have no track numbers, sort them by name.
+* If songs in media library have no track numbers, sort them by their display format.
 * Fixed a situation in which songs added to playlist from media library or playlist editor screens would not be immediately marked as such.
 
 ncmpcpp-0.8 (2017-05-21)

src/screens/media_library.cpp

@@ -127,8 +127,9 @@ public:
 		if (ret != 0)
 			return ret < 0;
 
-		// If there are no track numbers, sort by name.
+		// If track numbers are equal, sort by the display format.
-		return a.getName() < b.getName();
+		return Format::stringify<char>(Config.song_library_format, &a)
+		     < Format::stringify<char>(Config.song_library_format, &b);
 	}
 };