Unable to implement CellRenderer.render with ImplementClass

[MaeIsBad]

This is a follow up to #325 but since I cannot reopen it I've decided to make a new issue

If I try to implement the render method using the master version of the library from git I get an gtk_cell_renderer_render: assertion 'GTK_CELL_RENDERER_GET_CLASS (cell)->render != NULL' failed error

Minimal reproducible example

import std.stdio;
import gtk.CellRenderer;
import cairo.Context;
import gtk.TreeView;
import gtk.TreeViewColumn;
import gtk.ListStore;
import gtk.Widget;
import gtk.Main;
import gtk.MainWindow;

class Renderer: CellRenderer {
    import gtkd.Implement;
    import gobject.c.functions : g_object_newv;

    mixin ImplementClass!GtkCellRenderer;
    this() {
       super(cast(GtkCellRenderer*)g_object_newv(getType(), 0, null), true);
    }

    override void render(Context cr, Widget widget, GdkRectangle* backgroundArea, GdkRectangle* cellArea, GtkCellRendererState flags) {
    }


}



void main(string[] args)
{
        Main.init(args);

	ListStore ls = new ListStore([GType.INT]);
	ls.setValue(ls.createIter(), 0, 0);

	Renderer r = new Renderer();
	TreeViewColumn col = new TreeViewColumn("test", r, "test", 0);

	TreeView view = new TreeView();
	view.setModel(ls);

	view.appendColumn(col);

        MainWindow win = new MainWindow("test");
	win.add(view);
	win.showAll();

        Main.run();
}

[MikeWey]

It might have something to do with the private part of GtkCellRenderer. I'll have to take a closer look.

[MaeIsBad]

Thank you very much!