fix but failed

src/settings/components/form/keymaps-form.jsx

@@ -100,7 +100,7 @@ class KeymapsForm extends Component {
       return;
     }
 
-    let next = Object.assign({}, this.props.value);
+    let next = { ...this.props.value };
     next[e.target.name] = e.target.value;
 
     this.props.onChange(next);

src/settings/components/form/properties-form.jsx

@@ -44,7 +44,7 @@ class PropertiesForm extends Component {
     }
 
     let name = e.target.name;
-    let next = Object.assign({}, this.props.value);
+    let next = { ...this.props.value };
     if (e.target.type.toLowerCase() === 'checkbox') {
       next[name] = e.target.checked;
     } else if (e.target.type.toLowerCase() === 'number') {

src/settings/components/form/search-form.jsx

@@ -53,10 +53,10 @@ class SearchForm extends Component {
     let value = this.props.value;
     let name = e.target.name;
     let index = e.target.getAttribute('data-index');
-    let next = Object.assign({}, {
+    let next = {
       default: value.default,
       engines: value.engines ? value.engines.slice() : [],
-    });
+    };
 
     if (name === 'name') {
       next.engines[index][0] = e.target.value;