I’ve been thinking about this some more and I think if hitting reply auto-quoted the content of the post on which the reply button was hit, we are going to get a lot of bloat.
One idea I was tossing around is this:
If you selected a portion of the post, then a “Quote” button could pop up next to Reply, and then if you clicked the quote button, you’d go down to the post form with the content you selected pre-quoted in your draft post in the editor.
This is just an idea, but requires moderate complexity to implement, and is likely to be a little brittle (because of javascript requirements), especially on mobile. So, I want to be careful, noting that “yes, we can do this…but is it worth the dev time, effort, and potential incompatibility or unexpected behavior with some browsers?”