For notifications > see all, there is no longer any indication of read
or unread, nor any way to toggle the same.
Please include this functionality. It makes for easier cleaning of an
inbox. It would allow me to open threads in new tabs, and if it's
something I can't test at the moment, leave as unread or toggle back to
unread (depending on what the default behavior is on open (I seem
to have experienced both)).
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