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BUG on vanillaforums.org: can no longer delete your own comments on activity wall.
posted a comment on a user's activity wall underneath a system generated message. could not delete
activity-comment.
this was possible in yester years.
in vanilla 2.1 there is a delete comment anchor to the right of the time of comment, however this is not available on vanillaforums.org.
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.
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Might be related to this
https://github.com/vanilla/vanilla/pull/2679/files
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I haven't tested the changes you point to @Bleistivt but it may not fix the problem related to a user posting a comment under a system generated message on another person's activity wall. It looks like it may be overlooked.
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.