I am trying to create a context menu, which will show in the Gtk4 window on mouse right click. In case of Gtk3 i used gtk_menu_popup_at_pointer(GTK_MENU(popup), event) function to show context menu, but this function is removed from gtk4. In Gtk4 How can this be done?

I tried it this way, but it is showing —
Gtk-WARNING **: 08:37:09.566: Finalizing GtkApplicationWindow 0x563d9f0da290, but it still has children left: massage! check this script —

#include <gtk/gtk.h>

void create_window ( GtkApplication *application );
static void quit   ( GSimpleAction *action, GVariant *parameter, gpointer data );
static void msg   ( GSimpleAction *action, GVariant *parameter, gpointer data );

static void
click_pos_on_button_release (GtkGesture *click,
                               int n_press,
                               gdouble x,
                               gdouble y,
                               gpointer user_data)
{
    GdkEventSequence *sequence = gtk_gesture_single_get_current_sequence (
            GTK_GESTURE_SINGLE (click));
    GdkEvent *event = gtk_gesture_get_last_event (click, sequence);
    g_print ("%f  %fn", x, y);

         GdkRectangle rectangle;
         rectangle.x = x;
         rectangle.y = y;
         rectangle.width = 1;
         rectangle.height = 1;
         
         gtk_popover_set_pointing_to (GTK_POPOVER (user_data), &rectangle);

         gtk_popover_popup (GTK_POPOVER (user_data));
    
    gtk_gesture_set_sequence_state (GTK_GESTURE (click), sequence,
                                    GTK_EVENT_SEQUENCE_CLAIMED);
}


int main ( int argc, char **argv )
{
    GtkApplication *application;
    int status;

    /// ***
    application = gtk_application_new ( "gtk.example", G_APPLICATION_FLAGS_NONE );
    g_signal_connect_swapped ( application, "activate", G_CALLBACK ( create_window ), application );

    /// ***
    status = g_application_run ( G_APPLICATION ( application ), argc, argv );
    g_object_unref ( application );

    return status;
}

void create_window ( GtkApplication *application )
{
    GtkWidget *window;
    GMenu *menubar;
    GMenu *menu;
    GMenuItem *close_item, *pref_menu_item;

    /// ***
    window = gtk_application_window_new ( application );
    gtk_window_set_application ( GTK_WINDOW ( window ), application );

    /// ***
    const GActionEntry entries[] =
    {
        {"close", quit, NULL, NULL, NULL, { 0, 0, 0 } },
        {"Preferences", msg, NULL, NULL, NULL, { 0, 0, 0 } } 
    };

    /// **
    g_action_map_add_action_entries ( G_ACTION_MAP ( application ), entries, G_N_ELEMENTS ( entries ), NULL );

    /// ***
    menubar = g_menu_new();
    menu    = g_menu_new();
    close_item    = g_menu_item_new ( "Close", "app.close" );
    pref_menu_item = g_menu_item_new("Preferences", "app.Preferences");


    /// *** add item on menu
    g_menu_append_item ( menu, close_item );
    g_menu_append_item ( menu, pref_menu_item );
    g_object_unref ( close_item );
    g_object_unref ( pref_menu_item );


    /// ***
    g_menu_append_submenu ( menubar, "File", G_MENU_MODEL ( menu ) );
    g_object_unref ( menu );

    /// ***
    gtk_application_set_menubar ( application, G_MENU_MODEL ( menubar ) );
    gtk_application_window_set_show_menubar ( GTK_APPLICATION_WINDOW ( window ), FALSE );


    GMenuModel *model;
    model = G_MENU_MODEL(menu);

    GtkWidget *popover = gtk_popover_menu_new_from_model_full (G_MENU_MODEL (model), GTK_POPOVER_MENU_NESTED);
    gtk_popover_set_autohide (GTK_POPOVER (popover), TRUE);  
    gtk_popover_set_has_arrow (GTK_POPOVER (popover), FALSE);

    gtk_widget_set_parent (popover, window);

        GtkGesture *gesture = gtk_gesture_click_new ();
        gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (gesture), GDK_BUTTON_SECONDARY);
        GtkEventController *controller = GTK_EVENT_CONTROLLER (gesture);
        g_signal_connect (controller, "pressed", G_CALLBACK (click_pos_on_button_release), popover);
        gtk_widget_add_controller (window, controller);

    /// ***
    gtk_window_present ( GTK_WINDOW ( window ) );
}

static void quit ( GSimpleAction *action, G_GNUC_UNUSED GVariant *parameter, G_GNUC_UNUSED gpointer data )
{
    g_print ( "You choose `%s` actionn", g_action_get_name ( G_ACTION( action ) ) );
}

static void msg ( GSimpleAction *action, G_GNUC_UNUSED GVariant *parameter, G_GNUC_UNUSED gpointer data )
{
    g_print ( "You choose `%s` actionn", g_action_get_name ( G_ACTION( action ) ) );
}

*Thanks in advance to the answerers.