After getting too tired of people saying things like
I’m getting crazy with cells becoming hidden in a way I’m not in full control.
I just rewrote how cell input/output hiding works. Now there is a little toggle triangle in the very left column next to the input cell divider, and also next to the output. That’s how you toggle visibility of input and output.
%html no longer “magically” hide the input,
and double clicking on the output doesn’t do anything anymore.
It’s simple, straightforward, and you are in control.
Additionally, a second level of line numbering helps to orient inside a cell and across the whole document.