fix: Don't trigger two flychecks when saving files that are part of targets #20635
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When the user pressed save in a source file that was part of a specific target, rust-analyzer would trigger two flychecks on the workspace that the file was a part of:
cargo check -p <package> (--bin | --example | --test | --benchmark) <target>
)cargo check --workspace
)The triggering of the second flycheck cancelled the first, so there was no correctness issue, but the behavior undesirable regardless.
This PR fixes this by making sure that the workspace level check is not triggered if a package check was already triggered.
Closes #20436