Commit 2abded2e authored by Richard M. Stallman's avatar Richard M. Stallman
Browse files

(Undo): Document extensible undo entries.

parent f9d0b1ed
......@@ -1228,6 +1228,16 @@ relocated due to deletion of surrounding text, and that it moved
@var{adjustment} character positions. Undoing this element moves
@var{marker} @minus{} @var{adjustment} characters.
@item (apply @var{funname} . @var{args})
This is an extensible undo item, which is undone by calling
@var{funname} with arguments @var{args}.
@item (apply @var{delta} @var{beg} @var{end} @var{funname} . @var{args})
This is an extensible undo item, which records a change limited to the
range @var{beg} to @var{end}, which increased the size of the buffer
by @var{delta}. It is undone by calling @var{funname} with arguments
@var{args}.
@item nil
This element is a boundary. The elements between two boundaries are
called a @dfn{change group}; normally, each change group corresponds to
......
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