You guys pop up a notification if someone else is editing a page or blog post, it would be great if you could do the same for the design manager, as it has happened frequently that my coworkers and I leave a tab open while we’re working on a site and without knowing it overwrite eachother’s changes later.
This also happens on your own too where I will unintentionally have 2 design manager browser tabs open at the same time have edits saved in one version then later switch back to the old tab and accidentally overwrite my own changes.