Pre-pause execution

[okennedy]

What pain point is this feature intended to address? Please describe. Editing a cell forces re-execution of all dependent cells, which can get cumbersome if there are many dependencies. It's possible to freeze cells to avoid this behavior, but it can be frustrating when a dependent cell starts (invalidating its previous results) before you realize you should have frozen it.

Describe the solution you'd like If executing a cell with sufficiently expensive dependencies (e.g., dependencies that took >5 s cumulatively to run last time), inform the user that there are dependencies to run (e.g., in a little toast-style status indicator) and offer: (i) Run them, (ii) Switch the current session to a don't care mode where you keep running them, or (iii) Freeze them.

Describe alternatives you've considered See above; Freezing the cells manually is the only alternative, and that has to happen before you make the expensive changes.