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972b9f55a7
Fix using global options before an alias. Options before an alias were being ignored (like `cargo -v b`). The solution is to extract those global options before expanding an alias, and then merging it later. An alternative to this is to try to avoid discarding the options during expansion, but I couldn't figure out a way to get the position of the subcommand in the argument list. Clap only provides a way to get the arguments *following* the subcommand. I also cleaned up some of the code in `Config::configure`, which was carrying some weird baggage from previous refactorings. Fixes #7834