Instead of the user creating new cells, deleting cells, etc, as Pluto notebook will feel like a single page that you write on. Cell delimitations are figured out by the system.

Example differences

Deleting 'cells'

Is now just deleting an empty line: put your cursor there and press Backspace

Adding 'cells'

Put you cursor at the beginning/end of a line and press Enter.

Moving between 'cells'

Arrow keys

Running cells

Run on Enter makes me a bit nervous in the REPL, so maybe Run on Shift+Enter, and normally cells just stay "dirty", and they all run when you do Ctrl+S (like today).

Line numbers

Not sure - not really necessary since we added interactive stack traces anyways

Borders around cells - spacing between cells

Nope - two consecutive cells (without output inbetween) feel like one

Space between cells

Just like notion and a text editor - you add an empty cell/line inbetween

Buttons

Run button inside CodeMirror, at the final line of an expression.

Delete button gone