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Stefan Monnier authored
* lisp/mh-e/mh-letter.el (mh-letter-completion-at-point): New function, extracted from mh-letter-complete (mh-letter-mode, mh-letter-complete, mh-letter-complete-or-space): Use it. (mh-complete-word): Only use the common-substring arg when it works. (mh-folder-expand-at-point): * lisp/mh-e/mh-alias.el (mh-alias-letter-expand-alias): Return data suitable for completion-at-point-functions. * lisp/mh-e/mh-utils.el (mh-folder-completion-function): Make it work like file-name completion, so partial-completion can do its job. * lisp/minibuffer.el (completion-at-point, completion-help-at-point): Don't presume that a given completion-at-point-function will always use the same calling convention.
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