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and `/ M' to filter-derived-mode.
* lisp/ibuf-ext.el (ibuffer-list-buffer-modes): Simplify; avoid add-to-list.
(ibuffer-filter-by-mode, ibuffer-filter-by-used-mode)
(ibuffer-mark-by-mode): Use default rather than initial-input.
(ibuffer-filter-by-derived-mode): Autoload and require-match.