prev: make revset code more similar to `next` #11900

Job	Run time
Check protos	25s
Check protos	25s
Check formatting	15s
Check formatting	15s
Build jj-lib without Git support	43s
Build jj-lib without Git support	43s
build (ubuntu-latest)	4m 2s
build (ubuntu-latest)	4m 2s
Clippy check	2m 21s
Clippy check	2m 21s
cargo-deny (advisories)	24s
cargo-deny (advisories)	24s
build (macos-14)	3m 16s
build (macos-14)	3m 16s
cargo-deny (bans licenses sources)	25s
cargo-deny (bans licenses sources)	25s
Check that MkDocs can build the docs with Poetry 1.8	29s
Check that MkDocs can build the docs with Poetry 1.8	29s
build (windows-latest)	9m 2s
build (windows-latest)	8m 12s
Check that MkDocs can build the docs	21s
Check that MkDocs can build the docs	21s
build (ubuntu-latest, --all-features)	5m 1s
build (ubuntu-latest, --all-features)	5m 1s
	52m 38s

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