Feed item isnt marked as read if opened in new tab using the link context menu

[eggsgent]

Using version 0.2.1

1. Right click on a feed item and select to open in a new tab
2. Go back to the feed and inspect feed item status

Expected result: Feed item should be marked as read
Actual result: Feed is marked with blue dot / in unread state

[adamsanderson]

This is slightly tricky since read/unread state is currently not aware of your current browsing, and I want to make sure Brook has a minimal impact on browsing performance. That said, I think we can hook tab loading, and check it against the currently selected feed's items. That should be cheap and get the expected behavior.

[eggsgent]

Ok, thanks for looking into it, I enjoy the minimal approach very much!