Fix #6581? (#6585)

* Update avatar.vue

* Update avatar.vue

* Update avatar.vue

src/client/components/avatar.vue

@@ -40,7 +40,23 @@ export default Vue.extend({
 				: this.user.avatarUrl;
 		},
 	},
+	watch: {
+		'user.avatarBlurhash'() {
+			this.$el.style.color = this.getBlurhashAvgColor(this.user.avatarBlurhash);
+		}
+	},
+	mounted() {
+		this.$el.style.color = this.getBlurhashAvgColor(this.user.avatarBlurhash);
+	},
 	methods: {
+		getBlurhashAvgColor(s) {
+			return typeof s == 'string'
+				? '#' + [...s.slice(2, 6)]
+						.map(x => '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz#$%*+,-.:;=?@[]^_{|}~'.indexOf(x))
+						.reduce((a, c) => a * 83 + c, 0)
+						.toString(16)
+				: undefined;
+		},
 		onClick(e) {
 			this.$emit('click', e);
 		}