Last modified: 2011-03-13 18:05:36 UTC
"Reverts never cause an edit conflict - if between you pressing edit, and then
pressing post, someone else edits the page, their edits will be silently
overwritten (though still in the page history). Beware of reverting high-traffic
pages! Conversely, if it looks like someone has deleted your edits, consider if
it's more likely that it's one of these unfortunate reversion conflicts."
Clarification: that it text from the URL. I haven't tested this myself.
yes it is known that editing an old version WILL NOT create an edit conflict
this is by design
this should be in the help pages but it doesn't belong here
Why is this by design?