fix(scanner): allow disabling splitting with the Tags config option (#3869)

Signed-off-by: Deluan <deluan@navidrome.org>

model/metadata/map_participants.go

@@ -176,7 +176,11 @@ func (md Metadata) getRoleValues(role model.TagName) []string {
 	if len(values) == 0 {
 		return nil
 	}
-	if conf := model.TagRolesConf(); len(conf.Split) > 0 {
+	conf := model.TagMainMappings()[role]
+	if conf.Split == nil {
+		conf = model.TagRolesConf()
+	}
+	if len(conf.Split) > 0 {
 		values = conf.SplitTagValue(values)
 		return filterDuplicatedOrEmptyValues(values)
 	}
@@ -193,7 +197,11 @@ func (md Metadata) getArtistValues(single, multi model.TagName) []string {
 	if len(vSingle) != 1 {
 		return vSingle
 	}
-	if conf := model.TagArtistsConf(); len(conf.Split) > 0 {
+	conf := model.TagMainMappings()[single]
+	if conf.Split == nil {
+		conf = model.TagArtistsConf()
+	}
+	if len(conf.Split) > 0 {
 		vSingle = conf.SplitTagValue(vSingle)
 		return filterDuplicatedOrEmptyValues(vSingle)
 	}

model/tag_mappings.go

@@ -201,7 +201,7 @@ func loadTagMappings() {
 			aliases = oldValue.Aliases
 		}
 		split := cfg.Split
-		if len(split) == 0 {
+		if split == nil {
 			split = oldValue.Split
 		}
 		c := TagConf{