bash autocompletion affects paths to redirection

Summary

When element-path is set, then bash completion applies this path. Unfortunately it also applies to non parameters. For example stream redirections.

Steps to reproduce

With freedestkop-sdk:

mkdir my-logs
bst show --deps all bootstrap/bootstrap.bst >m

Then try to auto-complete to my-logs by pressing tab.

What is the current bug behavior?

It does not find my-logs, instead it proposes manifests/ or multiarch/ which are in elements.

What is the expected correct behavior?

It should auto-complete to my-logs.

Relevant logs and/or screenshots

Possible fixes

Other relevant information

• BuildStream version affected: /milestone %BuildStream_v1.x

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