Dynamically calculate the width of the author column in TagListComponent

[qixiaoo]

Is your feature request related to a problem? Please describe.
When the window size is not big enough, the author in the CommitList is truncated automatically. However, the author in the TagListComponent always take up 19 characters width space.

Describe the solution you'd like
Calculate the width of the author column dynamically, like CommitList component.

Describe alternatives you've considered
-

Additional context
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[stale]

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