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By default, Emacs inserts tabs in place of multiple spaces when it formats a
region. (For example, you might indent many lines of text all at once with
the indent-region command.) Tabs look fine on a terminal or with
ordinary printing, but they produce badly indented output when you use
TeX or Texinfo since TeX ignores tabs.
The following turns off Indent Tabs mode:
;;; Prevent Extraneous Tabs (setq-default indent-tabs-mode nil)
Note that this line uses setq-default rather than the setq
that we have seen before; setq-default sets values only in buffers
that do not have their own local values for the variable.