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I have a forum in which people with a certain role can post and edit, and people with another role cannot post, nor edit (but they can on another forum).
I came to that setup with advanced_forum and forum_access.
When some people with the second role read the forum, they have no permission to reply to posts, but the button to post a reply is present (and broken).
So here's a little patch that consider permissions handled by forum_access and eventually hide the button.