Under my old forum 3.0.x, I had a facility where members could not edit their messages if someone had already posted a reply.
Under 3.1.x, I can set a time limit for members to edit their messages (I think the default is 120 minutes), but I'd like to change it so that, if anyone replies to their messages, they can't edit their last message (even though it can be within the 120 minutes time limit).
In other words, the 120 minutes time limit would be overridden by the fact that someone had replied to their last message - which makes sense to me!
I managed to do this under my 3.0.x forum but, to be honest, I can't remember how I did it - whether by modifications of some core files or through a MOD).
Now, I was recently advised here by david63 that, owing the new architecture of phpBB 3.1.x
So what do you recommend I do so that I implement this change?is not recommended that you change core files but make any changes by using extensions, that way updating/upgrading is easier. (...) be aware that you may have to reapply such changes when you update.