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test: Migrate publish snapshotting to snapbox

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### What does this PR try to resolve? This is part of #14039 and allows snapshotting in more places. ### How should we test and review this PR? ### Additional...

feat: Stabilize MSRV-aware resolver config

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### What does this PR try to resolve? This includes - `cargo generate-lockfile --ignore-rust-version` - `cargo update --ignore-rust-version` This does not include - `edition = "2024"` - `resolver = "3"`...

With `CARGO_COMPLETE`, `--target`, `--bin`, etc show both values and flags

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For example 

Bad error message when a strong dep features's depedency is an unused optional dependency

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### Problem If nothing can activate an optional dependency, cargo acts as if the dependency doesn't exist which creates poor error messages. Also, with how things are arranged, the unused...

feat(resolve): Direct people to working around less optimal MSRV-resolver results

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### What does this PR try to resolve? In discussing #14414, the general problem of the resolver picking a version older than a package needs for its MSRV (or lack...

Loading of a git source is slow due to always checking if the submodule is updated

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When you have some git dependencies or patches, loading them takes a long time For the traces from #14238, notice how slow the first `resolve` is compared to the second....

`ValueHint` works well for ahead-of-time generated completions as it tells the generator what shell behavior to opt-in to. However, its not really needed with Rust-native completions and actually puts more...

Compare zsh  With bash 

As reported in rust-lang/cargo#14545 ``` ++++ actual: In-memory 1 + Deprecation: the legacy temporary assignment syntax is deprecated; use "tmp" instead 2 + /tmp/cargo/target/tmp/cit/t0/home/elvish/rc.elv:3:7: eval (E:CARGO_COMPLETE=elvish cargo | slurp) ```...

Allow groups of groups

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A blocker for #4697 which is important for #3123 and #2621 is the ability to have a group own another group. API-wise, I suspect we'd change `ArgGroup::arg` to `ArgGroup::member` or...