Fix: Truncated music-set song names cause warning log.

The music-set does not need to be selected for this to occur.

Resolved by using std::string instead of fixed buffer for song names,
which avoids manual string copying and removes the length limit.

src/base_media_base.h

@@ -289,7 +289,7 @@ enum MusicTrackType {
 
 /** Metadata about a music track. */
 struct MusicSongInfo {
-	char songname[32];       ///< name of song displayed in UI
+	std::string songname;    ///< name of song displayed in UI
 	byte tracknr;            ///< track number of song displayed in UI
 	const char *filename;    ///< file on disk containing song (when used in MusicSet class, this pointer is owned by MD5File object for the file)
 	MusicTrackType filetype; ///< decoder required for song file

src/music.cpp

@@ -128,7 +128,6 @@ bool MusicSet::FillSetDetails(IniFile *ini, const char *path, const char *full_f
 		for (uint i = 0; i < lengthof(this->songinfo); i++) {
 			const char *filename = this->files[i].filename;
 			if (names == nullptr || StrEmpty(filename) || this->files[i].check_result == MD5File::CR_NO_FILE) {
-				this->songinfo[i].songname[0] = '\0';
 				continue;
 			}
 
@@ -142,10 +141,9 @@ bool MusicSet::FillSetDetails(IniFile *ini, const char *path, const char *full_f
 				char *songname = GetMusicCatEntryName(filename, this->songinfo[i].cat_index);
 				if (songname == nullptr) {
 					Debug(grf, 0, "Base music set song missing from CAT file: {}/{}", filename, this->songinfo[i].cat_index);
-					this->songinfo[i].songname[0] = '\0';
 					continue;
 				}
-				strecpy(this->songinfo[i].songname, songname, lastof(this->songinfo[i].songname));
+				this->songinfo[i].songname = songname;
 				free(songname);
 			} else {
 				this->songinfo[i].filetype = MTT_STANDARDMIDI;
@@ -166,7 +164,7 @@ bool MusicSet::FillSetDetails(IniFile *ini, const char *path, const char *full_f
 
 			if (this->songinfo[i].filetype == MTT_STANDARDMIDI) {
 				if (item != nullptr && item->value.has_value() && !item->value->empty()) {
-					strecpy(this->songinfo[i].songname, item->value->c_str(), lastof(this->songinfo[i].songname));
+					this->songinfo[i].songname = item->value.value();
 				} else {
 					Debug(grf, 0, "Base music set song name missing: {}", filename);
 					return false;

src/music_gui.cpp

@@ -43,7 +43,7 @@ struct MusicSystem {
 		uint set_index;        ///< index of song in set
 
 		PlaylistEntry(const MusicSet *set, uint set_index) : MusicSongInfo(set->songinfo[set_index]), set(set), set_index(set_index) { }
-		bool IsValid() const { return !StrEmpty(this->songname); }
+		bool IsValid() const { return !this->songname.empty(); }
 	};
 	typedef std::vector<PlaylistEntry> Playlist;