I recently rejected an edit where the only improvement was elimination of double spaces after periods.
To be clear, on the internet, double spaces are unnecessary. If you look at the preview panel when you add a second space, most browsers just ignore it. I still do it out of habit from time to time.
This Wikipedia article talks a bit about the controversy, but let's go with the assumption that there is still some open debate about which is correct.
Generally, if someone edits a question and there are meaningful edits, I wouldn't care what they do with spacing after a period. However, I feel pretty comfortable rejecting an edit where that's the only improvement.
When there are other improvements that are necessary or helpful, I would probably just leave the edits they way they are. My question comes down to whether or not double spacing should be treated with similar respect to dialect, such as in this question.
If someone removes doubles spaces from someone's post, but makes other meaningful edits, should we remove the edit changing them from double to single spaces? People who type two spaces either just do it out of habit, because they believe it's still necessary, or do it on purpose. Are there people who consider it rude, and should we treat this like a dialect issue?