remove unused directive

packages/frontend/src/directives/follow-append.ts

@@ -1,40 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import { Directive } from 'vue';
-import { getScrollContainer, getScrollPosition } from '@@/js/scroll.js';
-
-export default {
-	mounted(src, binding, vn) {
-		if (binding.value === false) return;
-
-		let isBottom = true;
-
-		const container = getScrollContainer(src)!;
-		container.addEventListener('scroll', () => {
-			const pos = getScrollPosition(container);
-			const viewHeight = container.clientHeight;
-			const height = container.scrollHeight;
-			isBottom = (pos + viewHeight > height - 32);
-		}, { passive: true });
-		container.scrollTop = container.scrollHeight;
-
-		const ro = new ResizeObserver((entries, observer) => {
-			if (isBottom) {
-				const height = container.scrollHeight;
-				container.scrollTop = height;
-			}
-		});
-
-		ro.observe(src);
-
-		// TODO: 新たにプロパティを作るのをやめMapを使う
-		src._ro_ = ro;
-	},
-
-	unmounted(src, binding, vn) {
-		if (src._ro_) src._ro_.unobserve(src);
-	},
-} as Directive;