PanelEdit: Trigger refresh when changing data source (#30744)

public/app/features/dashboard/components/PanelEditor/PanelEditorQueries.tsx

@@ -49,7 +49,10 @@ export class PanelEditorQueries extends PureComponent<Props, State> {
   onOptionsChange = (options: QueryGroupOptions) => {
   onOptionsChange = (options: QueryGroupOptions) => {
     const { panel } = this.props;
     const { panel } = this.props;
 
 
-    panel.datasource = options.dataSource.default ? null : options.dataSource.name!;
+    const newDataSourceName = options.dataSource.default ? null : options.dataSource.name!;
+    const dataSourceChanged = newDataSourceName !== panel.datasource;
+
+    panel.datasource = newDataSourceName;
     panel.targets = options.queries;
     panel.targets = options.queries;
     panel.timeFrom = options.timeRange?.from;
     panel.timeFrom = options.timeRange?.from;
     panel.timeShift = options.timeRange?.shift;
     panel.timeShift = options.timeRange?.shift;
@@ -57,6 +60,11 @@ export class PanelEditorQueries extends PureComponent<Props, State> {
     panel.interval = options.minInterval;
     panel.interval = options.minInterval;
     panel.maxDataPoints = options.maxDataPoints;
     panel.maxDataPoints = options.maxDataPoints;
 
 
+    if (dataSourceChanged) {
+      // trigger queries when changing data source
+      setTimeout(this.onRunQueries, 10);
+    }
+
     this.setState({ options: options });
     this.setState({ options: options });
   };
   };