Comment 2 for bug 266109

I am marking this closed/fixed because the "discard all
deferred" checkbox was intended to work only on the summary
page. It's appearance on the detail pages was a mistake that
was fixed in 2.1.6.

So yes, in 2.1.5 neither "discard all deferred" checkbox
works on the detail pages, and BTW, you can check the box at
the top of the summary page and click the button at the
bottom or vice versa and it works.

In 2.1.6 and above, the checkboxes appear only on the
summary page and they only cause messages on that page
marked 'defer' to be discarded even if there are other
messages not rendered on that page.

Also, there are submit buttons at both the top and bottom of
both the 'all messages from' detail and the individual
message detail.

If you really want a "discard all messages marked defer" box
that works on the "view all messages from" page, that is now
a feature request (RFE) and should be resubmitted as such.