focus editor after clicking edit

src/components/views/elements/MessageEditor.js

@@ -144,6 +144,13 @@ export default class MessageEditor extends React.Component {
 
     componentDidMount() {
         this._updateEditorState();
+        const sel = document.getSelection();
+        const range = document.createRange();
+        range.selectNodeContents(this._editorRef);
+        range.collapse(false);
+        sel.removeAllRanges();
+        sel.addRange(range);
+        this._editorRef.focus();
     }
 
     render() {