Add tabulated-list-groups and Buffer-menu-group-by (bug#69305)
* doc/lispref/modes.texi (Tabulated List Mode): Add defvar tabulated-list-groups. * lisp/buff-menu.el (Buffer-menu-group-by): New defcustom. (Buffer-menu-unmark-all-buffers): Use tabulated-list-get-entry to check whether the current line contains an entry. (list-buffers-noselect): Enable outline-minor-mode for tabulated-list-groups. (list-buffers--refresh): When Buffer-menu-group-by is non-nil, set tabulated-list-groups. (Buffer-menu-group-by-mode, Buffer-menu-group-by-root): New functions. * lisp/emacs-lisp/tabulated-list.el (tabulated-list-groups): New buffer-local variable. (tabulated-list-print-fake-header): Add distinct overlay property 'fake-header'. (tabulated-list-header-overlay-p): Filter out overlays that don't have the property 'fake-header'. (tabulated-list-print): Use the variable 'tabulated-list-groups' to sort entries in groups separately. (tabulated-list-print-entries): New function factored out from 'tabulated-list-print'. * test/lisp/emacs-lisp/tabulated-list-tests.el (tabulated-list-groups): New test.
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