MediaAttachmentGrid: fix the container not removed

src/timelines/MediaAttachmentGrid.tsx

@@ -1,5 +1,11 @@
 import type { mastodon } from "masto";
-import { type Component, For, createSignal, onMount } from "solid-js";
+import {
+  type Component,
+  For,
+  createSignal,
+  onCleanup,
+  onMount,
+} from "solid-js";
 import { css } from "solid-styled";
 import tootStyle from "./toot.module.css";
 import MediaViewer from "./MediaViewer";
@@ -27,7 +33,15 @@ const MediaAttachmentGrid: Component<{
     const container = document.createElement("div");
     container.setAttribute("role", "presentation");
     document.body.appendChild(container);
-    let dispose: () => void
+
+    let dispose: () => void;
+
+    const removeContainer = () => {
+      setViewerIndex(undefined);
+      document.body.removeChild(container);
+      dispose();
+    };
+
     dispose = render(() => {
       return (
         <MediaViewer
@@ -35,11 +49,7 @@ const MediaAttachmentGrid: Component<{
           index={viewerIndex() || 0}
           onIndexUpdated={setViewerIndex}
           media={props.attachments}
-          onClose={() => {
-            setViewerIndex(undefined);
-            dispose();
-            document.body.removeChild(container)
-          }}
+          onClose={removeContainer}
         />
       );
     }, container);