Make the output of markdown cells expanded by default

[odanoburu]

Description

Specially for markdown cells, it is undesirable to have the output be collapsed by default, it should be expanded by default. When I write something, I don't want the reader to have to scroll the cell to read it.

Suggested solution

Make the output of the markdown cells expanded by default. For other kinds of cells, it might be useful to have a way of specifying that we want the output of the cell to be expanded or collapsed by default.

Alternative

No response

Additional context

Related discussion: #2765.

[akshayka]

Expanding pure markdown makes sense to me, thanks for the suggestion!

I'm hesitant to add configuration for other kinds of cells; seems less helpful, and adds more configuration/UI complexity.

[odanoburu]

I'm more than happy with just that, thank you :)