Can't open sidebar when annotation target is a link

When an annotation targets a link, the link activates as normal, which means that we see the sidebar open just in time for the page to refresh with the new location. The only way to see such an annotation is to open the sidebar and find it there - no way to see those annotations from the text itself.

See current behavior here:
http://jonudell.info/h/highlight-coincides-with-link.mp4

### Steps to reproduce
1. Browse to http://conf.a11yto.com/playlist
2. Select "Public" from group selector if not already selected
3. Click on any highlighted link (talk titles are good examples)

### Expected behaviour
Need to figure this out - one approach might be to stop propagation of the click and show a clickable link so that it's still navigable, similar to Google Docs:

### Actual behaviour
Sidebar opens, but page immediately navigates to new URL.

### Browser/system information
macOS Mojave/Chrome