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19.10 Displaying Boundaries

On a graphical display, Emacs can indicate the buffer boundaries in the fringes. It indicates the first line and the last line with angle images in the fringes. This can be combined with up and down arrow images which say whether it is possible to scroll the window up and down.

The buffer-local variable indicate-buffer-boundaries controls how the buffer boundaries and window scrolling is indicated in the fringes. If the value is left or right, both angle and arrow bitmaps are displayed in the left or right fringe, respectively.

If value is an alist, each element (indicator . position) specifies the position of one of the indicators. The indicator must be one of top, bottom, up, down, or t which specifies the default position for the indicators not present in the alist. The position is one of left, right, or nil which specifies not to show this indicator.

For example, ((top . left) (t . right)) places the top angle bitmap in left fringe, the bottom angle bitmap in right fringe, and both arrow bitmaps in right fringe. To show just the angle bitmaps in the left fringe, but no arrow bitmaps, use ((top . left) (bottom . left)).

The value of the variable default-indicate-buffer-boundaries is the default value for indicate-buffer-boundaries in buffers that do not override it.


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