Today I've edited out a part of a question which stated:
I have already searched related questions but was not able to find my solution so please don't down vote my question.
[screenshot showing Ask Ubuntu search]
The paragraph and the picture were changed to this line:
I have already searched related questions but was not able to find my solution.
OP now has provided additional information that was asked. This gave them the occasion to revert the edit by putting the whole "please don't downvote + picture" again.
IHMO asking not to downvote is inappropriate, or at least can be considered "noise". It could be counter-productive as well, leading to the opposite effect. I agree that explaining why a question should not be considered a duplicate is appropriate, but I am referring to the part asking not to downvote (or it could be "please don't close" as well).
Hence, before risking an edit war: what is the community consensus on this?