When I answer a question, I prefer to make the answer extensive - with a good MWE, a screenshot, some code comments, links to other questions, a solution that possibly goes a bit further than asked for. It takes some time to write an answer like this, and often it happens that somebody else posts an answer before I am fully finished and happy with the result.
If the other answer has the same solution or a better one (shorter/easier/better results) then I discard my own answer. When my solution is different but equally good or perhaps better, or possibly interesting for showing some general techniques, etc., I post it as a second answer. However, when I do discard my answer, I feel like my effort has been for nothing (except for learning something new myself).
Therefore, I would like to have some kind of "I am working on an answer"-button, so potential answerers can see that there is somebody who is, well, working on an answer, and decide not to start an answer of their own at this point - or to speed up :)
Alternatives would be to leave a comment (seems like the wrong place), to post an incomplete answer (seems wrong in general), or to announce in chat (will reach only chatroom regulars). Any thoughts on this?