un-indenting doesn't work with vim

[Mark J. Reed]

Put it another way: in vim (in insert mode), the tab key just inserts
a tab (which it displays as the number of spaces needed to get to the
next even value of whatever tabstop is set to).  It has nothing to do
with vim's idea of indentation, automatic or otherwise.

The control-D ("outdent" or "unindent") operation is the opposite not
of tab, but of control-T ("indent").   Both use the setting of
shiftwidth, not tabstop.

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