Some initial code to hook into the WithSearch component and check if we are using a HierarchicalListViewController.

bemade_hierarchical_tree_view/__manifest__.py

@@ -28,7 +28,7 @@
     'data': [],
     'assets': {
         'web.assets_backend': [
-            'bemade_hierarchical_tree_view/src/*/**',
+            'bemade_hierarchical_tree_view/static/src/*/**',
         ]
     },
     'installable': True,

bemade_hierarchical_tree_view/src/components/hierarchical_tree_view_controller.js

@@ -1,8 +0,0 @@
-/** @odoo-module **/
-
-import { ListController } from "@web/views/list/list_controller";
-import { ListRenderer } from "@web/views/list/list_renderer";
-
-export class HierarchicalTreeViewController extends ListController {
-
-}

bemade_hierarchical_tree_view/static/src/components/hierarchical_tree_view_controller.js

@@ -0,0 +1,18 @@
+/** @odoo-module **/
+
+import { ListController } from "@web/views/list/list_controller";
+
+export class HierarchicalTreeViewController extends ListController {
+
+}
+
+HierarchicalTreeViewController.props = {
+    ...ListController.props,
+    parentField: String,
+    childField: String,
+}
+HierarchicalTreeViewController.defaultProps = {
+    ...ListController.defaultProps,
+    parentField: 'parent_id',
+    childField: 'child_id',
+}

bemade_hierarchical_tree_view/static/src/components/with_search.js

@@ -0,0 +1,34 @@
+/** @odoo-module **/
+
+import {patch} from "@web/core/utils/patch";
+import {WithSearch} from "@web/search/with_search/with_search";
+import {onWillRender} from "@odoo/owl";
+import {HierarchicalTreeViewController} from "./hierarchical_tree_view_controller";
+
+patch(WithSearch.prototype, "bemade_hierarchical_tree_view/with_search", {
+    setup() {
+        onWillRender(() => {
+            let children = Object.hasOwn(this.__owl__, 'children') ? this.__owl__.children : null;
+            if (children && Object.keys(children).length !== 0) {
+                for (let childProp in children) {
+                    let child = children[childProp];
+                    if (Object.hasOwn(child, 'component')) {
+                        let childComponent = child.component;
+                        if (childComponent.prototype == HierarchicalTreeViewController.prototype) {
+                            let parentField, childField = (childComponent.parentField, childComponent.childField)
+                            let parentIndex = this.groupBy.indexOf(parentField);
+                            let childIndex = this.groupBy.indexOf(childField);
+                            if (parentIndex) {
+                                this.groupBy.splice(parentField, 1);
+                            }
+                            if (childField) {
+                                this.groupBy.splice(childField, 1);
+                            }
+                        }
+                    }
+                }
+            }
+        });
+        this._super();
+    }
+});