Code completion (review comments addressed)

[coeuvre]

Based on #209. Addressed the review comments.

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[coeuvre]

@alexfrasson I have forked your patch in #209, addressed the review comments and created this PR. If you are OK with this, please reply with @googlebot I consent. Thanks!

[google-cla]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

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[googlebot]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

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[philwo]

I'm manually overriding the CLA check for this PR, because

• this PR consists of three unmodified commits by @alexfrasson from https://github.com/bazelbuild/vscode-bazel/pull/209/commits for which we already have a signed CLA
• the other two comments are from @coeuvre who is a Googler, so the CLA doesn't apply.

@coeuvre I think we are good to merge this.

[coeuvre]

Rebased.

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A Googler has manually verified that the CLAs look good.

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[laurentlb]

lgtm