Re: isearch multiple buffers

[Richard M Stallman]

    Many Emacs packages already have different ways of specifying a set
    of buffers.  For instance, buff-menu.el and ibuffer.el use the key `m'
    to mark a set of buffers, and other keys (like `x', `v') to operate
    on a set of marked buffers.

This is making the existing problem worse!  We have so many different
ways of specifying a set of buffers, and each way corresponds to
different things you with the set.

The idea of filesets was to try to unify this -- to have various ways
of specifying a set, and indepedently, various things you can do with
a set.  The idea was to have something like the region: there are many
ways to set it, and many ways to use it.