QQuickRhiItemRenderer misses method for updating pipelines

According to the documentation the ``QQuickRhiItemRenderer::initialize`` is only called under certain conditions (e.g. texture size change, ...).

As far as I can see there is no way to (re-)create new pipelines triggered by the application logic. Or is the idea to create pipelines in the ``QQuickRhiItemRenderer::render`` method in such situations?