Resolve #821 (#822)

Please see code analysis at
https://github.com/maputnik/editor/issues/821#issuecomment-1772360990

src/components/AppToolbar.jsx

@@ -152,7 +152,7 @@ export default class AppToolbar extends React.Component {
         id: "inspect",
         group: "general",
         title: "Inspect",
-        disabled: this.props.renderer !== 'mlgljs',
+        disabled: this.props.renderer === 'ol',
       },
       {
         id: "filter-deuteranopia",

src/components/ModalSources.jsx

@@ -128,6 +128,7 @@ class AddSource extends React.Component {
       }
       case 'geojson_json': return {
         type: 'geojson',
+        cluster: source.cluster || false,
         data: {}
       }
       case 'tilejson_vector': return {

src/components/ModalSourcesTypeEditor.jsx

@@ -8,6 +8,7 @@ import FieldSelect from './FieldSelect'
 import FieldDynamicArray from './FieldDynamicArray'
 import FieldArray from './FieldArray'
 import FieldJson from './FieldJson'
+import FieldCheckbox from './FieldCheckbox'
 
 
 class TileJSONSourceEditor extends React.Component {
@@ -80,7 +81,7 @@ class TileURLSourceEditor extends React.Component {
         })}
       />
       {this.props.children}
-  </div>
+    </div>
 
   }
 }
@@ -205,23 +206,35 @@ class GeoJSONSourceFieldJsonEditor extends React.Component {
   }
 
   render() {
-    return <Block label={"GeoJSON"} fieldSpec={latest.source_geojson.data}>
-      <FieldJson
-        layer={this.props.source.data}
-        maxHeight={200}
-        mode={{
-          name: "javascript",
-          json: true
-        }}
-        lint={true}
-        onChange={data => {
+    return <div>
+      <Block label={"GeoJSON"} fieldSpec={latest.source_geojson.data}>
+        <FieldJson
+          layer={this.props.source.data}
+          maxHeight={200}
+          mode={{
+            name: "javascript",
+            json: true
+          }}
+          lint={true}
+          onChange={data => {
+            this.props.onChange({
+              ...this.props.source,
+              data,
+            })
+          }}
+        />
+      </Block>
+      <FieldCheckbox
+        label={'Cluster'}
+        value={this.props.source.cluster}
+        onChange={cluster => {
           this.props.onChange({
             ...this.props.source,
-            data,
+            cluster: cluster,
           })
         }}
       />
-    </Block>
+    </div>
   }
 }