From 8090429e9af510a965d7bcc3532f3f9331c45406 Mon Sep 17 00:00:00 2001
From: syuilo <4439005+syuilo@users.noreply.github.com>
Date: Sat, 31 May 2025 12:50:30 +0900
Subject: [PATCH] Update def.ts

---
 packages/frontend/src/preferences/def.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/packages/frontend/src/preferences/def.ts b/packages/frontend/src/preferences/def.ts
index 40e98fd928..8c66050c9c 100644
--- a/packages/frontend/src/preferences/def.ts
+++ b/packages/frontend/src/preferences/def.ts
@@ -374,6 +374,11 @@ export const PREF_DEF = {
 	watermarkPresets: {
 		accountDependent: true,
 		default: [] as WatermarkPreset[],
+		mergeStrategy: (a, b) => {
+			const sameIdExists = a.some(x => b.some(y => x.id === y.id));
+			if (sameIdExists) throw new Error();
+			return a.concat(b);
+		},
 	},
 	defaultWatermarkPresetId: {
 		accountDependent: true,