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A buffer can have blank areas called display margins on the left
and on the right. Ordinary text never appears in these areas, but you
can put things into the display margins using the
To put text in the left or right display margin of the window, use a
display specification of the form
(margin right-margin) or
(margin left-margin) on it. To put an image in a display margin,
use that display specification along with the display specification for
Before the display margins can display anything, you must give them a nonzero width. The usual way to do that is to set these variables:
Setting these variables does not immediately affect the window. These
variables are checked when a new buffer is displayed in the window.
Thus, you can make changes take effect by calling
You can also set the margin widths immediately.
(left . right). If window is
nil, the selected window is used.
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