"Select all in this view" seems to be tied to confirmation screen

If you set up a view with only one exposed action, some special-casing goes on:

1. The operation will become a button, rather than a selection.
2. You will lose the confirm screen.
3. Because you lose the confirm screen, you also seem to lose the "Select all nodes in this view" functionality; it will only affect the nodes on the current page.

Workaround: Enable more than one action so you get a select box for operations, instead of a button.

I don't anticipate this being fixed due to the notice on the project page, and I noticed that the 6.x code seems to be quite different here, so hopefully it's not a bug there too, but figured I'd document it just in case it helps someone else. :)