Dynamically calculate the width of the author column in TagListComponent

**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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