For as long as I can remember, just out of habit, I've ended lines from paragraphs in markdown with a double-space. But recently I've noticed some WYSIWYGs and even some people do not always do this. I don't even remember where I picked up the habit anymore.
Just to throw it out there, I only end sentences when I write prose with a single space.
Does this sound familiar to anyone? Did I pick it up from some legacy version of the format? Has it been replaced? Or did I get it accidentally from copying someone who ends their sentences with two spaces after the punctuation?