Could you also add an option on right click?

it'd also be nice to check if new variables exist in the context file that were never processed, otherwise it will always be skipped, unless one selects all variables.

I'll add a right-click option. 👍

For new variables: would it be a decent compromise to update the variables whenever you successfully save the context file in the GUI? Loading the context file often takes a few seconds, so doing it when showing this dialog either means an awkward pause before showing it, or a janky update after the list shows up, neither of which seem like great UX.

I'm also wondering about an option to process only variables which don't already have results, to fill in newly added variables.

For new variables: would it be a decent compromise to update the variables whenever you successfully save the context file in the GUI?

It is really that long to validate the file? 🤔
What do you think of having a "load new variables" button then on the widget? or a "process new variable" checkbox?

I'm thinking that I would be nice to have a visual indicator of the runs processing, particularly in this case of processing from the gui. But I think we don't have a way to monitor slurm jobs status yet, right?

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It is really that long to validate the file? 🤔

It's now common/normal to use a different Python environment for evaluating the context file from running the DAMNIT application. So validating it means launching a subprocess and then loading all the modules it imports. Between GPFS, which isn't great for lots of small files, and xarray, which gets its __version__ in a convenient but inefficient way, it can easily be a couple of seconds. Not a long time, but definitely not instant for GUI code, hence #291.

I'm thinking that I would be nice to have a visual indicator of the runs processing

Yup, I'm also planning that, but I wanted to do this first.

I'm happy with the current state, feel free to merge.
We can address the other points later if they are needed.

LGTM

Thanks for the review!