e546800737
bootstrap: `ensure(doc::Std)` no longer opens a browser In general, the rationale for `--open` is to only open HTML files if they were "explicitly" invoked from the CLI (e.g. `x doc --open library/core`). The existing logic did not do that. Instead it opened the docs unconditionally when a subset of the crates was requested. This is unfortunate for other Steps in bootstrap, which may wish to `ensure()` the standard library docs without opening them. Change `Std` to check if it was explicitly invoked, rather than assuming it's the case.
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