Remove ReadView and UpdateView traits

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

crates/editor/src/items.rs

@@ -78,7 +78,7 @@ impl FollowableItem for Editor {
                             == editor.read(cx).buffer.read(cx).as_singleton().as_ref();
                     ids_match || singleton_buffer_matches
                 })
-            });
+            })?;
 
             let editor = if let Some(editor) = editor {
                 editor