Reset app details menu on setting change

gh-2244

src/appIcons.js

@@ -1904,6 +1904,12 @@ export class TaskbarSecondaryMenu extends AppMenu.AppMenu {
     // replace quit item
     delete this._quitItem
     this._quitItem = this.addAction(_('Quit'), () => this._quitFromTaskbar())
+
+    source._signalsHandler.add([
+      SETTINGS,
+      'changed::secondarymenu-contains-showdetails',
+      () => this._setAppDetailsVisibility(source.app),
+    ])
   }
 
   updateQuitText() {
@@ -1946,7 +1952,19 @@ export class TaskbarSecondaryMenu extends AppMenu.AppMenu {
     super.setApp(app)
 
     // set "App Details" menu item visibility
+    this._setAppDetailsVisibility(app)
+  }
+
+  _setAppDetailsVisibility(app) {
+    // This next line sets the app details menu to visible if Gnome Software is
+    // installed. If it isn't, no point of showing the menu anymay because
+    // its only purpose is to opens Gnome Software
+    super._updateDetailsVisibility()
+
+    let gnomeSoftwareIsInstalled = this._detailsItem.visible
+
     this._detailsItem.visible =
+      gnomeSoftwareIsInstalled &&
       !app.hideDetails &&
       SETTINGS.get_boolean('secondarymenu-contains-showdetails')
   }

ui/BoxSecondaryMenuOptions.ui

@@ -28,6 +28,7 @@
         <child>
           <object class="AdwActionRow">
             <property name="title" translatable="yes">&lt;i&gt;App Details&lt;/i&gt; menu item</property>
+            <property name="subtitle" translatable="yes">&lt;i&gt;App Details&lt;/i&gt; is only available when Gnome Software is installed</property>
             <child>
               <object class="GtkSwitch" id="secondarymenu_showdetails_switch">
                 <property name="valign">center</property>