Automation editor: expand only root rows per default (#26712)

* Add default expand/collapse

* Readd expanded search param functionality

src/panels/config/script/manual-script-editor.ts

@@ -1,6 +1,6 @@
 import { mdiContentSave, mdiHelpCircle } from "@mdi/js";
 import { load } from "js-yaml";
-import type { CSSResultGroup } from "lit";
+import type { CSSResultGroup, PropertyValues } from "lit";
 import { css, html, LitElement, nothing } from "lit";
 import { customElement, property, query, state } from "lit/decorators";
 import { classMap } from "lit/directives/class-map";
@@ -17,6 +17,11 @@ import {
 import { ensureArray } from "../../../common/array/ensure-array";
 import { canOverrideAlphanumericInput } from "../../../common/dom/can-override-input";
 import { fireEvent } from "../../../common/dom/fire_event";
+import { constructUrlCurrentPath } from "../../../common/url/construct-url";
+import {
+  extractSearchParam,
+  removeSearchParam,
+} from "../../../common/url/search-params";
 import { computeRTL } from "../../../common/util/compute_rtl";
 import "../../../components/ha-icon-button";
 import "../../../components/ha-markdown";
@@ -221,6 +226,23 @@ export class HaManualScriptEditor extends LitElement {
     `;
   }
 
+  protected firstUpdated(changedProps: PropertyValues): void {
+    super.firstUpdated(changedProps);
+    const expanded = extractSearchParam("expanded");
+    if (expanded === "1") {
+      this._clearParam("expanded");
+      this.expandAll();
+    }
+  }
+
+  private _clearParam(param: string) {
+    window.history.replaceState(
+      null,
+      "",
+      constructUrlCurrentPath(removeSearchParam(param))
+    );
+  }
+
   private _fieldsChanged(ev: CustomEvent): void {
     ev.stopPropagation();
     this.resetPastedConfig();