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 command that we have seen before. The setq-default
command sets values only in buffers that do not have their own local
values for the variable.
See sections "Tabs vs. Spaces" and "Local Variables in Files" in The GNU Emacs Manual.
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