リモートアカウントの投稿に対しての返信にはメンションを付けるように

src/client/app/desktop/views/components/post-form.vue

@@ -105,21 +105,11 @@ export default Vue.extend({
 		}
 	},
 
-	watch: {
-		text() {
-			this.saveDraft();
-		},
-
-		poll() {
-			this.saveDraft();
-		},
-
-		files() {
-			this.saveDraft();
-		}
-	},
-
 	mounted() {
+		if (this.reply && this.reply.user.host != null) {
+			this.text = `@${this.reply.user.username}@${this.reply.user.host} `;
+		}
+
 		this.$nextTick(() => {
 			// 書きかけの投稿を復元
 			const draft = JSON.parse(localStorage.getItem('drafts') || '{}')[this.draftId];
@@ -134,10 +124,18 @@ export default Vue.extend({
 				}
 				this.$emit('change-attached-media', this.files);
 			}
+
+			this.$nextTick(() => this.watch());
 		});
 	},
 
 	methods: {
+		watch() {
+			this.$watch('text', () => this.saveDraft());
+			this.$watch('poll', () => this.saveDraft());
+			this.$watch('files', () => this.saveDraft());
+		},
+
 		focus() {
 			(this.$refs.text as any).focus();
 		},