Subtoolbar Palettes do not display at correct position, SL #3891

GTK_WIDGET_NO_WINDOW has been deprecated but we can use
gtk_widget_get_has_window() instead [1]. This brings back the
old code.

Follow up of: 5ab2b80546

[1] http://developer.gnome.org/gtk/stable/GtkWidget.html#GTK-WIDGET-NO-WINDOW:CAPS

Signed-off-by: Simon Schampijer <simon@laptop.org>
Acked-by: Manuel Quiñones <manuq@laptop.org>

src/sugar3/graphics/palettewindow.py

@@ -1005,6 +1005,10 @@ class WidgetInvoker(Invoker):
             x = 0
             y = 0
 
+        if not self._widget.get_has_window():
+            x += allocation.x
+            y += allocation.y
+
         rect = Gdk.Rectangle()
         rect.x = x
         rect.y = y