Revset to identify a megamerge

[9999years]

With the jj megamerge workflow, I'd like to have a command to create a new stream of work from the working commit. Currently, this looks like jj split -A 'trunk()' -B my_megamerge ..

I'd like to write a revset alias that identifies the megamerge commit.

Here’s the best i’ve got so far, but it doesn’t work reliably if you have multiple megamerges or if you have commits that merge with each other as ancestors of the megamerge commit.

revset-aliases.M = "latest(merges() & mine() & mutable() & fork_point(trunk() | @)::, 1)"

Is there a way to get the ‘descendent-most’ commit from a set of commits? (E.g. from a revset get a commit that doesn't have any of the other commits as a descendant?)

[jennings]

I am cheesy and I usually just jj describe -m "merge" my mega-merges, then I can select it with description(exact:"merge").