If I write an answer, then edit it 4 minutes later, it doesn't show up as edited. Does it still bump the question?
Similarly, if I edit my answer, and then re-edit it again 4 minutes later, it only shows up as one edit in the history;* does it bump the question once, or twice?
At least on SO's front page and more active tags, a question could easily have fallen pretty deep in 4 minutes, and I don't want to accidentally drag it back to the top just to fix a typo in my last edit.
* As a side note, what is this edit-coalescing feature called? Obviously not "edit coalescing", because searching for "coalesce edit" or "edit coalescing" only turns up 5 results, only one of which refers to this feature…