Fix Slate crash after inserting emoji from picker/autocomplete

src/app/components/editor/Elements.tsx

@@ -82,13 +82,21 @@ function RenderEmoticonElement({
   const selected = useSelected();
   const focused = useFocused();
 
+  // Void inline: attributes + contentEditable={false} on the same root, children
+  // as a sibling of the visual (not nested inside another non-editable span).
+  // Nesting {children} under an inner contentEditable={false} breaks Slate's
+  // DOM↔node map and crashes ReactEditor.focus after insert.
   return (
-    <span className={css.EmoticonBase} {...attributes}>
+    <span
+      {...attributes}
+      contentEditable={false}
+      className={css.EmoticonBase}
+      style={{ userSelect: 'none' }}
+    >
       <span
         className={css.Emoticon({
           focus: selected && focused,
         })}
-        contentEditable={false}
       >
         {element.key.startsWith('mxc://') ? (
           <img
@@ -99,8 +107,8 @@ function RenderEmoticonElement({
         ) : (
           element.key
         )}
-        {children}
       </span>
+      {children}
     </span>
   );
 }

src/app/components/editor/utils.ts

@@ -1,4 +1,5 @@
 import { BasePoint, BaseRange, Editor, Element, Point, Range, Text, Transforms } from 'slate';
+import { ReactEditor } from 'slate-react';
 import { BlockType, MarkType } from './types';
 import {
   CommandElement,
@@ -206,6 +207,29 @@ export const moveCursor = (editor: Editor, withSpace?: boolean) => {
   if (withSpace) editor.insertText(' ');
 };
 
+/**
+ * Focus the editor after React has committed DOM for recent transforms.
+ * Calling ReactEditor.focus immediately after insertNode/insertText (e.g. emoji +
+ * trailing space) races Slate's DOM map and throws:
+ * "Cannot resolve a DOM node from Slate node: {"text":" "}"
+ */
+export const safeFocusEditor = (editor: Editor) => {
+  const tryFocus = () => {
+    try {
+      ReactEditor.focus(editor);
+      return true;
+    } catch {
+      return false;
+    }
+  };
+
+  // Defer past the current React commit; retry once if the DOM map isn't ready yet.
+  requestAnimationFrame(() => {
+    if (tryFocus()) return;
+    setTimeout(tryFocus, 0);
+  });
+};
+
 interface PointUntilCharOptions {
   match: (char: string) => boolean;
   reverse?: boolean;