Convert to using `useMemoFuture`

lib/pages/full_post.dart

@@ -3,25 +3,30 @@ import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:lemmy_api_client/lemmy_api_client.dart';
 
+import '../hooks/memo_future.dart';
 import '../util/api_extensions.dart';
 import '../widgets/comment_section.dart';
 import '../widgets/post.dart';
+import '../widgets/save_post_button.dart';
 
 class FullPostPage extends HookWidget {
-  final Future<FullPostView> fullPost;
+  // final Future<FullPostView> fullPost;
+  final int id;
+  final String instanceUrl;
   final PostView post;
 
-  FullPostPage({@required int id, @required String instanceUrl})
+  FullPostPage({@required this.id, @required this.instanceUrl})
       : assert(id != null),
         assert(instanceUrl != null),
-        fullPost = LemmyApi(instanceUrl).v1.getPost(id: id),
         post = null;
   FullPostPage.fromPostView(this.post)
-      : fullPost = LemmyApi(post.instanceUrl).v1.getPost(id: post.id);
+      : id = post.id,
+        instanceUrl = post.instanceUrl;
 
   @override
   Widget build(BuildContext context) {
-    final fullPostSnap = useFuture(this.fullPost);
+    final fullPostSnap =
+        useMemoFuture(() => LemmyApi(instanceUrl).v1.getPost(id: id));
 
     // FALLBACK VIEW
 
@@ -78,6 +83,17 @@ class FullPostPage extends HookWidget {
             if (fullPostSnap.hasData)
               CommentSection(fullPost.comments,
                   postCreatorId: fullPost.post.creatorId)
+            else if (fullPostSnap.hasError)
+              Padding(
+                padding:
+                    const EdgeInsets.symmetric(horizontal: 10, vertical: 30),
+                child: Column(
+                  children: [
+                    Icon(Icons.error),
+                    Text('Error: ${fullPostSnap.error}')
+                  ],
+                ),
+              )
             else
               Container(
                 child: Center(child: CircularProgressIndicator()),