Display the Latest Comment Posted by the Currently Logged In User

import com.atlassian.jira.component.ComponentAccessor

def loggedInUser = ComponentAccessor.jiraAuthenticationContext.loggedInUser
def rendererManager = ComponentAccessor.rendererManager

def commentManager = ComponentAccessor.commentManager
def comments = commentManager.getComments(issue)

def filteredComments = comments.findAll {
    it.authorApplicationUser == loggedInUser
}

if (filteredComments) {
    def latestComment = filteredComments.last()
    rendererManager.getRenderedContent('atlassian-wiki-renderer', "${latestComment.authorApplicationUser.username}\n${latestComment.body}",
                                       issue.issueRenderContext)
}