This is a really helpful feature. A query though. Will that be another
feature request for the users of ibuffer. May be a variable
`project-list-buffers-function`.
Probably this could be implemented in ibuffer.el.
So when ibuffer is loaded, it could override the
keybinding 'C-x p C-b' with own function that uses
ibuffer filters with the current project buffers.
Might as well add 'project-ibuffer' to project.el straight, similarly to
how we have both 'project-shell' and 'project-eshell'.
Not sure where proliferating the number of keybindings for every
alternative will lead to. I'd rather try to use more
`define-alternatives' to allow choosing alternatives between
shell/eshell, list-buffers/ibuffer, ... with the same
project keybinding.