<p><a href="https://github.com/philiprbrenan" class="user-mention">@philiprbrenan</a> check the Addons plugin which provides a "Bookmark list" which pretty much does what you want, I guess.<br>
It adds a side bar tab called "Bookmarks" and lists all lines in the current document which have a line marker set. The list contains the line number as well as the line text.</p>

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