As others have done before, I accidentally upvoted a comment that I wanted to flag.
But I am not asking for a way to cancel the upvote. Rather I would suggest moving the "flag comment" to the right margin of the comments.
Currently, on the right margin one gets a link to the little cross in order to delete one's own comment; and on the left we have the up-vote and the flag. I think it would make more sense to have the flag on the right, together with the delete-comment button, and keep the upvote on the left. That way, there is no danger of upvoting when attempting to flag, and in a sense it keeps the positive and negative actions separate: positive action (up-voting) on the left, and negative action (delete, flag) on the right. It seems to me to make more sense.
So I am requesting that the Powers That Be consider moving the "flag this comment" link to the right of the comments.
editis also on the right, and it's not a negative function, so I don't quite think that this fully fits your new conceptual divide.
edittemporary? Because it goes away after 5 minutes? Upvote/flag go away when you cast one of those. In fact, for moderators,
editis the one thing that's least temporary, since the moderators can edit well after 5 minutes. And for us, it does hide when we're not hovering over it, just like all of the other icons.
51 mins agotext, with no phantom space for the "edit". What moderators get to see or not see, I couldn't tell you.
editbehaves pretty much exactly like the delete button does. But also, the "goes away entirely" is still the same for upvote/flag, once you actually cast one.