From 4aee139f6cc579588d0929c3a26de43900540d71 Mon Sep 17 00:00:00 2001
From: fiatjaf <fiatjaf@gmail.com>
Date: Sun, 5 Feb 2023 17:04:15 -0300
Subject: [PATCH] modify AppendUnique so it matches only the first two items.

---
 tags.go | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tags.go b/tags.go
index 2dd5ed8..f1d1c09 100644
--- a/tags.go
+++ b/tags.go
@@ -99,9 +99,15 @@ func (tags Tags) FilterOut(tagPrefix []string) Tags {
 	return filtered
 }
 
-// AppendUnique appends a tag if it doesn't exist yet, otherwise does nothing
+// AppendUnique appends a tag if it doesn't exist yet, otherwise does nothing.
+// the uniqueness comparison is done based only on the first 2 elements of the tag.
 func (tags Tags) AppendUnique(tag Tag) Tags {
-	if tags.GetFirst(tag) == nil {
+	n := len(tag)
+	if n > 2 {
+		n = 2
+	}
+
+	if tags.GetFirst(tag[:n]) == nil {
 		return append(tags, tag)
 	} else {
 		return tags