DEV: Untangle the admin sidebar from the sidebar code (#27640)

app/assets/javascripts/discourse/app/components/sidebar/api-section.gjs

@@ -1,99 +1,55 @@
-import Component from "@glimmer/component";
-import { getOwner, setOwner } from "@ember/owner";
-import { service } from "@ember/service";
 import Section from "./section";
 import SectionLink from "./section-link";
 
-export default class SidebarApiSection extends Component {
+const SidebarApiSection = <template>
-  @service sidebarState;
+  {{#if @section.filtered}}
+    <Section
+      @sectionName={{@section.name}}
+      @headerLinkText={{@section.text}}
+      @headerLinkTitle={{@section.title}}
+      @headerActionsIcon={{@section.actionsIcon}}
+      @headerActions={{@section.actions}}
+      @willDestroy={{@section.willDestroy}}
+      @collapsable={{@collapsable}}
+      @displaySection={{@section.displaySection}}
+      @hideSectionHeader={{@section.hideSectionHeader}}
+      @collapsedByDefault={{@section.collapsedByDefault}}
+    >
+      {{#each @section.filteredLinks key="name" as |link|}}
+        <SectionLink
+          @linkName={{link.name}}
+          @linkClass={{link.classNames}}
+          @route={{link.route}}
+          @model={{link.model}}
+          @query={{link.query}}
+          @models={{link.models}}
+          @href={{link.href}}
+          @title={{link.title}}
+          @contentCSSClass={{link.contentCSSClass}}
+          @prefixColor={{link.prefixColor}}
+          @prefixBadge={{link.prefixBadge}}
+          @prefixType={{link.prefixType}}
+          @prefixValue={{link.prefixValue}}
+          @prefixCSSClass={{link.prefixCSSClass}}
+          @suffixType={{link.suffixType}}
+          @suffixValue={{link.suffixValue}}
+          @suffixCSSClass={{link.suffixCSSClass}}
+          @hoverType={{link.hoverType}}
+          @hoverValue={{link.hoverValue}}
+          @hoverAction={{link.hoverAction}}
+          @hoverTitle={{link.hoverTitle}}
+          @currentWhen={{link.currentWhen}}
+          @didInsert={{link.didInsert}}
+          @willDestroy={{link.willDestroy}}
+          @content={{link.text}}
+          @contentComponent={{component
+            link.contentComponent
+            status=link.contentComponentArgs
+          }}
+        />
+      {{/each}}
+    </Section>
+  {{/if}}
+</template>;
 
-  constructor() {
+export default SidebarApiSection;
-    super(...arguments);
-
-    this.section = new this.args.sectionConfig();
-    setOwner(this.section, getOwner(this));
-  }
-
-  get shouldDisplay() {
-    return (
-      !this.sidebarState.currentPanel.filterable ||
-      this.sidebarState.filter.length === 0 ||
-      this.filteredLinks.length > 0
-    );
-  }
-
-  get filteredLinks() {
-    if (!this.sidebarState.filter) {
-      return this.section.links;
-    }
-
-    if (
-      this.section.text.toLowerCase().match(this.sidebarState.sanitizedFilter)
-    ) {
-      return this.section.links;
-    }
-
-    return this.section.links.filter((link) => {
-      return (
-        link.text
-          .toString()
-          .toLowerCase()
-          .match(this.sidebarState.sanitizedFilter) ||
-        link.keywords.navigation.some((keyword) =>
-          keyword.match(this.sidebarState.filter)
-        )
-      );
-    });
-  }
-
-  <template>
-    {{#if this.shouldDisplay}}
-      <Section
-        @sectionName={{this.section.name}}
-        @headerLinkText={{this.section.text}}
-        @headerLinkTitle={{this.section.title}}
-        @headerActionsIcon={{this.section.actionsIcon}}
-        @headerActions={{this.section.actions}}
-        @willDestroy={{this.section.willDestroy}}
-        @collapsable={{@collapsable}}
-        @displaySection={{this.section.displaySection}}
-        @hideSectionHeader={{this.section.hideSectionHeader}}
-        @collapsedByDefault={{this.section.collapsedByDefault}}
-      >
-        {{#each this.filteredLinks key="name" as |link|}}
-          <SectionLink
-            @linkName={{link.name}}
-            @linkClass={{link.classNames}}
-            @route={{link.route}}
-            @model={{link.model}}
-            @query={{link.query}}
-            @models={{link.models}}
-            @href={{link.href}}
-            @title={{link.title}}
-            @contentCSSClass={{link.contentCSSClass}}
-            @prefixColor={{link.prefixColor}}
-            @prefixBadge={{link.prefixBadge}}
-            @prefixType={{link.prefixType}}
-            @prefixValue={{link.prefixValue}}
-            @prefixCSSClass={{link.prefixCSSClass}}
-            @suffixType={{link.suffixType}}
-            @suffixValue={{link.suffixValue}}
-            @suffixCSSClass={{link.suffixCSSClass}}
-            @hoverType={{link.hoverType}}
-            @hoverValue={{link.hoverValue}}
-            @hoverAction={{link.hoverAction}}
-            @hoverTitle={{link.hoverTitle}}
-            @currentWhen={{link.currentWhen}}
-            @didInsert={{link.didInsert}}
-            @willDestroy={{link.willDestroy}}
-            @content={{link.text}}
-            @contentComponent={{component
-              link.contentComponent
-              status=link.contentComponentArgs
-            }}
-          />
-        {{/each}}
-      </Section>
-    {{/if}}
-  </template>
-}

app/assets/javascripts/discourse/app/components/sidebar/api-sections.gjs

@@ -1,32 +1,89 @@
 import Component from "@glimmer/component";
+import { cached } from "@glimmer/tracking";
+import { getOwner, setOwner } from "@ember/owner";
 import { service } from "@ember/service";
-import AdminHeader from "./admin-header";
 import ApiSection from "./api-section";
-import FilterNoResults from "./filter-no-results";
+import PanelHeader from "./panel-header";
 
 export default class SidebarApiSections extends Component {
   @service sidebarState;
 
   get sections() {
+    let sectionConfigs;
+
     if (this.sidebarState.combinedMode) {
-      return this.sidebarState.panels
+      sectionConfigs = this.sidebarState.panels
         .filter((panel) => !panel.hidden)
         .flatMap((panel) => panel.sections);
     } else {
-      return this.sidebarState.currentPanel.sections;
+      sectionConfigs = this.sidebarState.currentPanel.sections;
     }
+
+    return sectionConfigs.map((Section) => {
+      const SidebarSection = prepareSidebarSectionClass(Section);
+
+      const sectionInstance = new SidebarSection({
+        filterable:
+          !this.sidebarState.combinedMode &&
+          this.sidebarState.currentPanel.filterable,
+        sidebarState: this.sidebarState,
+      });
+
+      setOwner(sectionInstance, getOwner(this));
+
+      return sectionInstance;
+    });
+  }
+
+  get filteredSections() {
+    return this.sections.filter((section) => section.filtered);
   }
 
   <template>
-    <AdminHeader />
+    <PanelHeader @sections={{this.filteredSections}} />
 
-    {{#each this.sections as |sectionConfig|}}
+    {{#each this.filteredSections as |section|}}
-      <ApiSection
+      <ApiSection @section={{section}} @collapsable={{@collapsable}} />
-        @sectionConfig={{sectionConfig}}
-        @collapsable={{@collapsable}}
-      />
     {{/each}}
-
-    <FilterNoResults />
   </template>
 }
+
+// extends the class provided for the section to add functionality we don't want to be overridable when defining custom
+// sections using the plugin API, like for example the filtering capabilities
+function prepareSidebarSectionClass(Section) {
+  return class extends Section {
+    constructor({ filterable, sidebarState }) {
+      super();
+
+      this.filterable = filterable;
+      this.sidebarState = sidebarState;
+    }
+
+    @cached
+    get filteredLinks() {
+      if (!this.filterable || !this.sidebarState.filter) {
+        return this.links;
+      }
+
+      if (this.text.toLowerCase().match(this.sidebarState.sanitizedFilter)) {
+        return this.links;
+      }
+
+      return this.links.filter((link) => {
+        return (
+          link.text
+            .toString()
+            .toLowerCase()
+            .match(this.sidebarState.sanitizedFilter) ||
+          link.keywords.navigation.some((keyword) =>
+            keyword.match(this.sidebarState.filter)
+          )
+        );
+      });
+    }
+
+    get filtered() {
+      return !this.filterable || this.filteredLinks?.length > 0;
+    }
+  };
+}

app/assets/javascripts/discourse/app/components/sidebar/back-to-forum.gjs

@@ -1,28 +1,17 @@
-import Component from "@glimmer/component";
 import { LinkTo } from "@ember/routing";
-import { service } from "@ember/service";
-import { ADMIN_PANEL } from "discourse/lib/sidebar/panels";
 import { defaultHomepage } from "discourse/lib/utilities";
 import icon from "discourse-common/helpers/d-icon";
 import i18n from "discourse-common/helpers/i18n";
 
-export default class BackToForum extends Component {
+const BackToForum = <template>
-  @service sidebarState;
+  <LinkTo
+    @route="discovery.{{(defaultHomepage)}}"
+    class="sidebar-sections__back-to-forum"
+  >
+    {{icon "arrow-left"}}
 
-  get shouldDisplay() {
+    <span>{{i18n "sidebar.back_to_forum"}}</span>
-    return this.sidebarState.isCurrentPanel(ADMIN_PANEL);
+  </LinkTo>
-  }
+</template>;
 
-  <template>
+export default BackToForum;
-    {{#if this.shouldDisplay}}
-      <LinkTo
-        @route="discovery.{{(defaultHomepage)}}"
-        class="sidebar-sections__back-to-forum"
-      >
-        {{icon "arrow-left"}}
-
-        <span>{{i18n "admin.back_to_forum"}}</span>
-      </LinkTo>
-    {{/if}}
-  </template>
-}

app/assets/javascripts/discourse/app/components/sidebar/filter-no-results.gjs

@@ -1,32 +1,21 @@
 import Component from "@glimmer/component";
 import { service } from "@ember/service";
-import { htmlSafe } from "@ember/template";
 import i18n from "discourse-common/helpers/i18n";
-import getURL from "discourse-common/lib/get-url";
-import I18n from "discourse-i18n";
 
 export default class FilterNoResults extends Component {
   @service sidebarState;
 
-  /**
-   * Component is rendered when panel is filtreable
-   * Visibility is additionally controlled by CSS rule `.sidebar-section-wrapper + .sidebar-no-results`
-   */
   get shouldDisplay() {
-    return this.sidebarState.currentPanel.filterable;
+    return (
+      this.sidebarState.currentPanel.filterable &&
+      !!(this.args.sections?.length === 0)
+    );
   }
 
   get noResultsDescription() {
-    const params = {
+    return this.sidebarState.currentPanel.filterNoResultsDescription(
-      filter: this.sidebarState.filter,
+      this.sidebarState.filter
-      settings_filter_url: getURL(
+    );
-        `/admin/site_settings/category/all_results?filter=${this.sidebarState.filter}`
-      ),
-      user_list_filter_url: getURL(
-        `/admin/users/list/active?username=${this.sidebarState.filter}`
-      ),
-    };
-    return htmlSafe(I18n.t("sidebar.no_results.description", params));
   }
 
   <template>
@@ -35,9 +24,11 @@ export default class FilterNoResults extends Component {
         <h4 class="sidebar-no-results__title">{{i18n
             "sidebar.no_results.title"
           }}</h4>
-        <p
+        {{#if this.noResultsDescription}}
-          class="sidebar-no-results__description"
+          <p class="sidebar-no-results__description">
-        >{{this.noResultsDescription}}</p>
+            {{this.noResultsDescription}}
+          </p>
+        {{/if}}
       </div>
     {{/if}}
   </template>

app/assets/javascripts/discourse/app/components/sidebar/footer.gjs

@@ -5,7 +5,7 @@ import DButton from "discourse/components/d-button";
 import SidebarSectionForm from "discourse/components/modal/sidebar-section-form";
 import PluginOutlet from "discourse/components/plugin-outlet";
 import routeAction from "discourse/helpers/route-action";
-import { ADMIN_PANEL } from "discourse/lib/sidebar/panels";
+import { MAIN_PANEL } from "discourse/lib/sidebar/panels";
 
 export default class SidebarFooter extends Component {
   @service capabilities;
@@ -16,7 +16,7 @@ export default class SidebarFooter extends Component {
   @service sidebarState;
 
   get showManageSectionsButton() {
-    return this.currentUser && !this.sidebarState.isCurrentPanel(ADMIN_PANEL);
+    return this.currentUser && this.sidebarState.isCurrentPanel(MAIN_PANEL);
   }
 
   get showToggleMobileButton() {

app/assets/javascripts/discourse/app/components/sidebar/panel-header.gjs

@@ -1,28 +1,29 @@
 import Component from "@glimmer/component";
 import { service } from "@ember/service";
-import { ADMIN_PANEL } from "discourse/lib/sidebar/panels";
 import BackToForum from "./back-to-forum";
 import Filter from "./filter";
+import FilterNoResults from "./filter-no-results";
 import ToggleAllSections from "./toggle-all-sections";
 
-export default class AdminHeader extends Component {
+export default class PanelHeader extends Component {
   @service sidebarState;
 
   get shouldDisplay() {
-    return this.sidebarState.isCurrentPanel(ADMIN_PANEL);
+    return this.sidebarState.currentPanel.displayHeader;
   }
 
   <template>
     {{#if this.shouldDisplay}}
-      <div class="sidebar-admin-header">
+      <div class="sidebar-panel-header">
-        <div class="sidebar-admin-header__row">
+        <div class="sidebar-panel-header__row">
           <BackToForum />
           <ToggleAllSections @sections={{@sections}} />
         </div>
-        <div class="sidebar-admin-header__row">
+        <div class="sidebar-panel-header__row">
           <Filter />
         </div>
       </div>
+      <FilterNoResults @sections={{@sections}} />
     {{/if}}
   </template>
 }

app/assets/javascripts/discourse/app/components/sidebar/section-header.gjs

@@ -5,7 +5,7 @@ const SidebarSectionHeader = <template>
     <DButton
       @title="sidebar.toggle_section"
       @action={{@toggleSectionDisplay}}
-      aria-controls={{@sidebarSectionContentID}}
+      aria-controls={{@sidebarSectionContentId}}
       aria-expanded={{if @isExpanded "true" "false"}}
       class="sidebar-section-header sidebar-section-header-collapsable btn-transparent"
     >

app/assets/javascripts/discourse/app/components/sidebar/section.gjs

@@ -5,6 +5,10 @@ import { action } from "@ember/object";
 import didInsert from "@ember/render-modifiers/modifiers/did-insert";
 import { service } from "@ember/service";
 import { isEmpty } from "@ember/utils";
+import {
+  getCollapsedSidebarSectionKey,
+  getSidebarSectionContentId,
+} from "discourse/lib/sidebar/helpers";
 import icon from "discourse-common/helpers/d-icon";
 import i18n from "discourse-common/helpers/i18n";
 import { bind } from "discourse-common/utils/decorators";
@@ -16,8 +20,10 @@ export default class SidebarSection extends Component {
   @service keyValueStore;
   @service sidebarState;
 
-  sidebarSectionContentID = `sidebar-section-content-${this.args.sectionName}`;
+  sidebarSectionContentId = getSidebarSectionContentId(this.args.sectionName);
-  collapsedSidebarSectionKey = `sidebar-section-${this.args.sectionName}-collapsed`;
+  collapsedSidebarSectionKey = getCollapsedSidebarSectionKey(
+    this.args.sectionName
+  );
 
   willDestroy() {
     super.willDestroy(...arguments);
@@ -116,7 +122,7 @@ export default class SidebarSection extends Component {
           <div class="sidebar-section-header-wrapper sidebar-row">
             <SectionHeader
               @collapsable={{@collapsable}}
-              @sidebarSectionContentID={{this.sidebarSectionContentID}}
+              @sidebarSectionContentId={{this.sidebarSectionContentId}}
               @toggleSectionDisplay={{this.toggleSectionDisplay}}
               @isExpanded={{this.displaySectionContent}}
             >
@@ -174,7 +180,7 @@ export default class SidebarSection extends Component {
 
         {{#if this.displaySectionContent}}
           <ul
-            id={{this.sidebarSectionContentID}}
+            id={{this.sidebarSectionContentId}}
             class="sidebar-section-content"
           >
             {{yield}}

app/assets/javascripts/discourse/app/components/sidebar/toggle-all-sections.gjs

@@ -2,24 +2,30 @@ import Component from "@glimmer/component";
 import { action } from "@ember/object";
 import { service } from "@ember/service";
 import DButton from "discourse/components/d-button";
-import { ADMIN_NAV_MAP } from "discourse/lib/sidebar/admin-nav-map";
+import { getCollapsedSidebarSectionKey } from "discourse/lib/sidebar/helpers";
 
 export default class ToggleAllSections extends Component {
   @service sidebarState;
   @service keyValueStore;
 
+  get collapsableSections() {
+    return this.args.sections.filter(
+      (section) => section.displaySection && !section.hideSectionHeader
+    );
+  }
+
   get allSectionsExpanded() {
-    return ADMIN_NAV_MAP.every((adminNav) => {
+    return this.collapsableSections.every((section) => {
       return !this.sidebarState.collapsedSections.has(
-        `sidebar-section-${this.sidebarState.currentPanel.key}-${adminNav.name}-collapsed`
+        getCollapsedSidebarSectionKey(section.name)
       );
     });
   }
 
   get title() {
     return this.allSectionsExpanded
-      ? "admin.collapse_all_sections"
+      ? "sidebar.collapse_all_sections"
-      : "admin.expand_all_sections";
+      : "sidebar.expand_all_sections";
   }
 
   get icon() {
@@ -30,12 +36,11 @@ export default class ToggleAllSections extends Component {
   toggleAllSections() {
     const collapse = this.allSectionsExpanded;
 
-    ADMIN_NAV_MAP.forEach((adminNav) => {
+    this.collapsableSections.forEach((section) => {
-      const key = `${this.sidebarState.currentPanel.key}-${adminNav.name}`;
       if (collapse) {
-        this.sidebarState.collapseSection(key);
+        this.sidebarState.collapseSection(section.name);
       } else {
-        this.sidebarState.expandSection(key);
+        this.sidebarState.expandSection(section.name);
       }
     });
   }

app/assets/javascripts/discourse/app/lib/sidebar/admin-sidebar.js

@@ -1,4 +1,5 @@
 import { cached } from "@glimmer/tracking";
+import { htmlSafe } from "@ember/template";
 import PreloadStore from "discourse/lib/preload-store";
 import { ADMIN_NAV_MAP } from "discourse/lib/sidebar/admin-nav-map";
 import BaseCustomSidebarPanel from "discourse/lib/sidebar/base-custom-sidebar-panel";
@@ -6,6 +7,7 @@ import BaseCustomSidebarSection from "discourse/lib/sidebar/base-custom-sidebar-
 import BaseCustomSidebarSectionLink from "discourse/lib/sidebar/base-custom-sidebar-section-link";
 import { ADMIN_PANEL } from "discourse/lib/sidebar/panels";
 import { getOwnerWithFallback } from "discourse-common/lib/get-owner";
+import getURL from "discourse-common/lib/get-url";
 import I18n from "discourse-i18n";
 
 let additionalAdminSidebarSectionLinks = {};
@@ -81,6 +83,7 @@ class SidebarAdminSectionLink extends BaseCustomSidebarSectionLink {
 
     return this.adminSidebarNavLink.route;
   }
+
   get keywords() {
     return (
       this.adminSidebarStateManager.keywords[this.adminSidebarNavLink.name] || {
@@ -257,6 +260,7 @@ function installedPluginsLinkKeywords() {
 export default class AdminSidebarPanel extends BaseCustomSidebarPanel {
   key = ADMIN_PANEL;
   hidden = true;
+  displayHeader = true;
 
   @cached
   get sections() {
@@ -346,4 +350,18 @@ export default class AdminSidebarPanel extends BaseCustomSidebarPanel {
   get filterable() {
     return true;
   }
+
+  filterNoResultsDescription(filter) {
+    const params = {
+      filter,
+      settings_filter_url: getURL(
+        `/admin/site_settings/category/all_results?filter=${filter}`
+      ),
+      user_list_filter_url: getURL(
+        `/admin/users/list/active?username=${filter}`
+      ),
+    };
+
+    return htmlSafe(I18n.t("sidebar.no_results.description", params));
+  }
 }

app/assets/javascripts/discourse/app/lib/sidebar/base-custom-sidebar-panel.js

@@ -43,6 +43,13 @@ export default class BaseCustomSidebarPanel {
     this.hidden || this.#notImplemented();
   }
 
+  /**
+   * @returns {boolean} Controls whether the panel will display a header
+   */
+  get displayHeader() {
+    return false;
+  }
+
   /**
    * @returns {boolean} Controls whether the filter is shown
    */
@@ -50,6 +57,17 @@ export default class BaseCustomSidebarPanel {
     return false;
   }
 
+  /**
+   * @param {string} filter filter applied
+   *
+   * @returns {string | SafeString} Description displayed when the applied filter has no results.
+   * Use `htmlSafe` from `from "@ember/template` to use HTML strings.
+   */
+  // eslint-disable-next-line no-unused-vars
+  filterNoResultsDescription(filter) {
+    return null;
+  }
+
   #notImplemented() {
     throw "not implemented";
   }

app/assets/javascripts/discourse/app/lib/sidebar/helpers.js

@@ -15,3 +15,11 @@ export function hasDefaultSidebarCategories(siteSettings) {
 export function hasDefaultSidebarTags(siteSettings) {
   return siteSettings.default_navigation_menu_tags.length > 0;
 }
+
+export function getSidebarSectionContentId(name) {
+  return `sidebar-section-content-${name}`;
+}
+
+export function getCollapsedSidebarSectionKey(name) {
+  return `sidebar-section-${name}-collapsed`;
+}

app/assets/javascripts/discourse/app/services/sidebar-state.js

@@ -7,6 +7,7 @@ import {
   currentPanelKey,
   customPanels as panels,
 } from "discourse/lib/sidebar/custom-sections";
+import { getCollapsedSidebarSectionKey } from "discourse/lib/sidebar/helpers";
 import {
   COMBINED_MODE,
   MAIN_PANEL,
@@ -81,13 +82,15 @@ export default class SidebarState extends Service {
   }
 
   collapseSection(sectionKey) {
-    const collapsedSidebarSectionKey = `sidebar-section-${sectionKey}-collapsed`;
+    const collapsedSidebarSectionKey =
+      getCollapsedSidebarSectionKey(sectionKey);
     this.keyValueStore.setItem(collapsedSidebarSectionKey, true);
     this.collapsedSections.add(collapsedSidebarSectionKey);
   }
 
   expandSection(sectionKey) {
-    const collapsedSidebarSectionKey = `sidebar-section-${sectionKey}-collapsed`;
+    const collapsedSidebarSectionKey =
+      getCollapsedSidebarSectionKey(sectionKey);
     this.keyValueStore.setItem(collapsedSidebarSectionKey, false);
     this.collapsedSections.delete(collapsedSidebarSectionKey);
   }

app/assets/stylesheets/common/base/menu-panel.scss

@@ -338,7 +338,7 @@
     font-size: var(--font-down-1);
   }
 
-  .sidebar-admin-header__row {
+  .sidebar-panel-header__row {
     width: calc(320px - 2 * var(--d-sidebar-row-horizontal-padding));
   }
 

app/assets/stylesheets/common/base/sidebar.scss

@@ -373,11 +373,8 @@
 .sidebar-no-results {
   display: block;
 }
-.sidebar-section-wrapper + .sidebar-no-results {
-  display: none;
-}
 
-.sidebar-admin-header__row {
+.sidebar-panel-header__row {
   display: flex;
   justify-content: space-between;
   align-items: baseline;

config/locales/client.en.yml

@@ -4806,6 +4806,9 @@ en:
       panels:
         forum:
           label: Forum
+      back_to_forum: "Back to Forum"
+      collapse_all_sections: "Collapse all sections"
+      expand_all_sections: "Expand all sections"
       filter: "Filter..."
       clear_filter: "Clear filter"
       no_results:
@@ -4926,10 +4929,7 @@ en:
     admin:
       title: "Discourse Admin"
       moderator: "Moderator"
-      back_to_forum: "Back to Forum"
       filter_reports: Filter reports
-      expand_all_sections: "Expand all sections"
-      collapse_all_sections: "Collapse all sections"
 
       tags:
         remove_muted_tags_from_latest:

spec/system/admin_sidebar_navigation_spec.rb

@@ -31,6 +31,11 @@ describe "Admin Revamp | Sidebar Navigation", type: :system do
     expect(sidebar).to have_no_section("admin-root")
   end
 
+  it "displays the panel header" do
+    visit("/admin")
+    expect(sidebar).to have_panel_header
+  end
+
   it "collapses sections by default" do
     visit("/admin")
     links = page.all(".sidebar-section-link-content-text")
@@ -113,6 +118,27 @@ describe "Admin Revamp | Sidebar Navigation", type: :system do
     expect(page).to have_no_css(".sidebar-no-results")
   end
 
+  it "displays the no results description message correctly when the filter has no results" do
+    visit("/admin")
+
+    filter.filter("ieeee")
+    expect(page).to have_no_css(".sidebar-section-link-content-text")
+    expect(page).to have_css(".sidebar-no-results")
+
+    no_results_description = page.find(".sidebar-no-results__description")
+    expect(no_results_description.text).to eq(
+      "We couldn’t find anything matching ‘ieeee’.\n\nDid you want to search site settings or the admin user list?",
+    )
+    expect(no_results_description).to have_link(
+      "search site settings",
+      href: "/admin/site_settings/category/all_results?filter=ieeee",
+    )
+    expect(no_results_description).to have_link(
+      "admin user list?",
+      href: "/admin/users/list/active?username=ieeee",
+    )
+  end
+
   it "temporarily expands section when filter" do
     visit("/admin")
     links = page.all(".sidebar-section-link-content-text")

spec/system/page_objects/components/navigation_menu/sidebar.rb

@@ -49,6 +49,14 @@ module PageObjects
           find("#discourse-modal-title")
         end
 
+        def has_panel_header?
+          page.has_css?(".sidebar-panel-header")
+        end
+
+        def has_no_panel_header?
+          page.has_no_css?(".sidebar-panel-header")
+        end
+
         def toggle_all_sections
           find(".sidebar-toggle-all-sections").click
         end

spec/system/viewing_sidebar_spec.rb

@@ -136,4 +136,10 @@ describe "Viewing sidebar as logged in user", type: :system do
       expect(sidebar).to have_all_tags_section_link
     end
   end
+
+  it "shouldn't display the panel header for the main sidebar" do
+    visit("/latest")
+    expect(sidebar).to be_visible
+    expect(sidebar).to have_no_panel_header
+  end
 end