nip50: add filter.search field

filter.go

@@ -17,6 +17,7 @@ type Filter struct {
 	Since   *time.Time
 	Until   *time.Time
 	Limit   int
+	Search  string
 }
 
 type TagMap map[string][]string
@@ -109,5 +110,9 @@ func FilterEqual(a Filter, b Filter) bool {
 		return false
 	}
 
+	if a.Search != b.Search {
+		return false
+	}
+
 	return true
 }