Add a "squash" action to `jj arrange`#9037

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martinvonz wants to merge 3 commits intomainfrom

mz/splwzttzvowt

Commits on Mar 9, 2026

arrange: add a validation step & don't update state if it fails
martinvonz
committed
arrange: extract function for updating UI state from key event
martinvonz
committed
arrange: add support for "squash" (while discarding message)
martinvonz
committed