TLにNote追加時にdeepcopyする (#6275)

src/client/components/timeline.vue

@@ -50,7 +50,8 @@ export default Vue.extend({
 		});
 
 		const prepend = note => {
-			(this.$refs.tl as any).prepend(note);
+			const _note = JSON.parse(JSON.stringify(note));	// deepcopy
+			(this.$refs.tl as any).prepend(_note);
 
 			if (this.sound) {
 				this.$root.sound(note.userId === this.$store.state.i.id ? 'noteMy' : 'note');