New permission/ACL for toggling message editing

[mchaker]

Problem

Users are able to edit messages after sending them in channels or communities where that is not desired.

Proposal

I propose that there should be a role permission line item for "edit message", just like the "Send messages" line item.

Notes

Some contexts require write-once participation.

Other use cases of this feature would be to prevent "edit trolling" where a user posts one thing, gets responses, then edits their message post-hoc to something entirely different.

Checks

• I searched existing discussions.

[midblep]

Love this! Great for things like item bidding, form submissions, etc.