GNU bug report logs - #20367
new option for indent-tabs-mode: respect existing

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Subject: new option for indent-tabs-mode: respect existing
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Package: emacs
Version: 24.5
Severity: wishlist

Please add a new value for indent-tabs-mode that means "when visiting an
existing file, try to detect whether it uses tabs or spaces and set
indent-tabs-mode according". Eg 'detect, 'guess, 'exist or somesuch.