While yes, you are correct. (the "All" option replaces the icon in the next UI)
Based on the info given in the question unto itself, I agree with the answer.
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
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