[v8.1.x] Variables: Fix not updating inside a Panel when the preceding Row uses "Repeat For" (#39141)

Co-authored-by: Maria Alexandra <239999+axelavargas@users.noreply.github.com>

public/app/features/dashboard/state/DashboardModel.ts

@@ -714,9 +714,11 @@ export class DashboardModel {
         panelBelowIndex = insertPos + rowPanels.length;
       }
 
-      // Update gridPos for panels below
-      for (let i = panelBelowIndex; i < this.panels.length; i++) {
-        this.panels[i].gridPos.y += yPos;
+      // Update gridPos for panels below if we inserted more than 1 repeated row panel
+      if (selectedOptions.length > 1) {
+        for (let i = panelBelowIndex; i < this.panels.length; i++) {
+          this.panels[i].gridPos.y += yPos;
+        }
       }
     }
   }