- added small addition to pychan documentation - not sure if we should file a bug ticket here: - pychan widgets have beforeShow / afterHide methods, which can be overriden (and are empty) - BUT if you have a container widget, those methods contain the call _resetTiling(), which seems to be vital for the layout engine - so, on overriding the containers beforeShow, you'll also loose this call - therefore e.g. a background_image is "invisible"

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