fringes-outside-margins

fringes-outside-margins is a variable defined in `C source code'.
Its value is

nil

• Automatically becomes buffer-local when set.

Documentation:
Non-nil means to display fringes outside display margins.
A value of nil means to display fringes between margins and buffer text.

Setting this variable does not take effect until a new buffer is displayed
in a window. To make the change take effect, call `set-window-buffer'.