There's a newish add-on at https://marketplace.atlassian.com/plugins/com.redmoon.jira.commenthistory.commenthistory
that shows the history of changes to comments (delete comment, edit comment, change visibility etc). I know this is all stored in the issuehistory table in the DB but somehow I recall seeing this information in the regular issue History tab.
Are changes to comments really not shown in the History tab?
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