Scene responsive size only when enlarging the parent container

[benbovy]

The ipygany scene is resized and redrawn when enlarging the size of the parent container, but not when reducing the size.

https://user-images.githubusercontent.com/4160723/106442487-9d6f3c80-647b-11eb-855a-c95b4d107f2f.mp4

Is it intended behavior? Other widgets such as ipygany's ColorBar or ipyleaflet's Map seem to be fully responsive.

[martinRenou]

This is bug. The flickering as well is very odd, this should not happen.