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Lars Ingebrigtsen authored
* doc/lispref/errors.texi (Standard Errors): Mention the new error. * lisp/files.el (auto-mode-alist): Add a bunch of image suffixes to the list (bug#37972) based on the output from "gm convert -list format" (i.e., graphicsmagick). * lisp/image-mode.el (image-mode): Rewrite to possibly notify the user about image-use-external-converter. (image-mode--setup-mode): Factor out into own function and don't run under `condition-case' as there's nothing here that should error. * lisp/image.el (unknown-image-type): New error. (image-type): Signal that error so that image-mode can offer sensible feedback to the user.
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