fit-frame-to-buffer-sizes

fit-frame-to-buffer-sizes is a variable defined in `window.el'.
Its value is

(nil nil nil nil)

Documentation:
Size boundaries of frame for `fit-frame-to-buffer'.
This list specifies the total maximum and minimum lines and
maximum and minimum columns of the root window of any frame that
shall be fit to its buffer. If any of these values is non-nil,
it overrides the corresponding argument of `fit-frame-to-buffer'.

On window systems where the menubar can wrap, fitting a frame to
its buffer may swallow the last line(s). Specifying an
appropriate minimum width value here can avoid such wrapping.

See also `fit-frame-to-buffer-margins'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.4 of Emacs.