Make QWidget not synchronously send move and resize events for top level widgets

When a top level widget is being shown or resize is called on it, it will synchronously send a resize event. The tst_QWidget::childEvent test even tests for this behavior.

Instead we really should wait for the platform plugin or the Windowing System to give us some events that will be sent to the QWidgetWindow and then propogated down to the tlw QWidget.