Notebook output must support more ANSI sequences #118833
Description
follow up from #116416 (comment) and other discussions
Kernels often print stdout/stderr content with the assumption of being connected to a terminal. With that mindset they send ANSI sequences. Some of those sequences we support, like colors. We current don't support the sequence that clears the screen and that forces the jupyter extension to employ funny workarounds: they scan all output for that sequence, remember that so that they can clear the output before appending the next chunk. Things would be much simpler for them if we would simply support that ANSI sequence.