I have the habit of deleting my comments whenever I find them unnecessary anymore (for instance, I notified the OP that there's a typo, and it got fixed).
Mostly, the user replies with (something along the lines of) “thanks, I fixed it”, and by that time, my comment would have already been gone (after I saw the post/comment was edited) or I just right away delete my comment; often, the situation becomes awkward as many seem to never notice that the comment isn't there anymore.
I began doing this after I saw it happening several times, especially in my posts, so I thought that it is a common practice here.
I have two questions:
Is this actually a common practice?
If yes, should I notify the user of the deletion of my comment?