Fix alias issue when tagging performer from stash-box (#4820)

pkg/scraper/stashbox/stash_box.go

@@ -676,6 +676,9 @@ func performerFragmentToScrapedPerformer(p graphql.PerformerFragment) *models.Sc
 			return !strings.EqualFold(s, p.Name)
 		})
 
+		// #4596 - stash-box may return duplicate aliases. Filter these out
+		p.Aliases = stringslice.UniqueFold(p.Aliases)
+
 		alias := strings.Join(p.Aliases, ", ")
 		sp.Aliases = &alias
 	}

pkg/sliceutil/stringslice/string_collections.go

@@ -29,3 +29,18 @@ func FromString(s string, sep string) []string {
 	}
 	return v
 }
+
+// Unique returns a slice containing only unique values from the provided slice.
+// The comparison is case-insensitive.
+func UniqueFold(s []string) []string {
+	seen := make(map[string]struct{})
+	var ret []string
+	for _, v := range s {
+		if _, exists := seen[strings.ToLower(v)]; exists {
+			continue
+		}
+		seen[strings.ToLower(v)] = struct{}{}
+		ret = append(ret, v)
+	}
+	return ret
+}