C-x t N

[Eli Zaretskii]

NEWS says:

  *** 'C-x t N' creates a new tab at the specified absolute position.
  It also supports a negative argument.

The doc string says:

  Add a new tab at the absolute position TO-INDEX.
  TO-INDEX counts from 1.  If no TO-INDEX is specified, then add
  a new tab at the position specified by ‘tab-bar-new-tab-to’.
  Negative TO-INDEX counts tabs from the end of the tab bar.

I think the interpretation of the negative values here is
counter-intuitive, because using -1 will add a new tab to the right of
the rightmost tab, and if that's what is meant by "from the end of the
tab bar", then what exactly is "the end of the tab bar" needs to be
explicitly documented.