refactor: Replace timeouts with robust DOM waits in TreeList logic (#8560)

Author: tobiu

apps/portal/view/news/tickets/MainContainerController.mjs

@@ -123,8 +123,13 @@ class MainContainerController extends Controller {
             tree.expandParents(itemId);
 
             if (!oldValue?.hashString?.startsWith('/news/tickets')) {
-                await me.timeout(100);
-                tree.scrollToItem(itemId)
+                // Wait for the expansion VDOM update to be applied and the item to be visible in the DOM
+                const id   = tree.getItemId(itemId),
+                      rect = await tree.waitForDomRect({id, attempts: 20, delay: 20});
+
+                if (rect) {
+                    tree.scrollToItem(itemId)
+                }
             }
         };
 

apps/portal/view/shared/content/TreeList.mjs

@@ -64,7 +64,6 @@ class TreeList extends BaseTreeList {
      */
     async afterSetCurrentPageRecord(value, oldValue) {
         if (value) {
-            await this.timeout(20);
             this.selectionModel.select(value)
         }
     }