Horrible new unsaved buffers dialog

[Po Lu]

The dialog that would show up when you picked File -> Quit from the menu
bar used to show a dialog for each unsaved file's buffer with several
handy options to view and act on the buffer and unsaved changes.

In this morning's master, it only shows a single "unsaved buffers"
dialog, which is completely inadequate when there is more than one
unsaved file.  I don't understand why this change was made which turns
said dialog box from a convenient feature into an eyesore.

Thanks.