fixes #2221 characters getting deleted between file changes

Author: Chaitanya Narhare

client/modules/IDE/components/Editor/index.jsx

@@ -235,6 +235,16 @@ class Editor extends React.Component {
 
   componentDidUpdate(prevProps) {
     if (this.props.file.id !== prevProps.file.id) {
+      const fileMode = this.getFileMode(this.props.file.name);
+      if (fileMode === 'javascript') {
+        // Define the new Emmet configuration based on the file mode
+        const emmetConfig = {
+          preview: ['html'],
+          markTagPairs: false,
+          autoRenameTags: true
+        };
+        this._cm.setOption('emmet', emmetConfig);
+      }
       const oldDoc = this._cm.swapDoc(this._docs[this.props.file.id]);
       this._docs[prevProps.file.id] = oldDoc;
       this._cm.focus();