places-menu: Add nautilus-specific items

Both the "Starred" and "Network" locations are internal to nautilus
and not exposed to gvfs.

We can still support them by opening them explicitly in nautilus,
so add corresponding places if nautilus is installed and set up
as default file manager.

After this change, the list of places should be consistent with
the sidebar in the file manager again.

Closes: https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/issues/522
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/340>

extensions/places-menu/placeDisplay.js

@@ -123,6 +123,20 @@ class PlaceInfo extends EventEmitter {
     }
 }
 
+class NautilusSpecialInfo extends PlaceInfo {
+    constructor(file, name, icon) {
+        super('special', file, name, icon);
+
+        const appSystem = Shell.AppSystem.get_default();
+        this._app = appSystem.lookup_app('org.gnome.Nautilus.desktop');
+    }
+
+    launch(timestamp) {
+        const launchContext = global.create_app_launch_context(timestamp, -1);
+        this._app.appInfo.launch([this.file], launchContext);
+    }
+}
+
 class PlaceDeviceInfo extends PlaceInfo {
     _init(kind, mount) {
         this._mount = mount;
@@ -288,6 +302,12 @@ export class PlacesManager extends EventEmitter {
         this._places.special.forEach(p => p.destroy());
         this._places.special = [];
 
+        const appSystem = Shell.AppSystem.get_default();
+        const nautilusApp = appSystem.lookup_app('org.gnome.Nautilus.desktop');
+        const defaultFm = Gio.AppInfo.get_default_for_type('inode/directory', true);
+        const showNautilusSpecials =
+            nautilusApp && defaultFm && nautilusApp.appInfo.equal(defaultFm);
+
         const homeFile = Gio.File.new_for_path(GLib.get_home_dir());
 
         this._places.special.push(new PlaceInfo(
@@ -302,6 +322,13 @@ export class PlacesManager extends EventEmitter {
                 _('Recent')));
         }
 
+        if (showNautilusSpecials) {
+            this._places.special.push(new NautilusSpecialInfo(
+                Gio.File.new_for_uri('starred:///'),
+                _('Starred'),
+                'starred-symbolic'));
+        }
+
         if (this._settings.get_boolean('show-desktop-icons')) {
             const desktopPath = GLib.get_user_special_dir(
                 GLib.UserDirectory.DIRECTORY_DESKTOP);
@@ -315,6 +342,13 @@ export class PlacesManager extends EventEmitter {
             }
         }
 
+        if (showNautilusSpecials) {
+            this._places.special.push(new NautilusSpecialInfo(
+                Gio.File.new_for_uri('x-network-view:///'),
+                _('Network'),
+                'network-workgroup-symbolic'));
+        }
+
         this._places.special.push(new PlaceInfo(
             'special',
             Gio.File.new_for_uri('trash:///'),