Commit 0e29c77f authored by Richard M. Stallman's avatar Richard M. Stallman
Browse files

(Undo): Document undo-in-progress.

parent 791887d9
......@@ -1244,6 +1244,12 @@ calls @code{undo-boundary} after each replacement, so that the user can
undo individual replacements one by one.
@end defun
@defvar undo-in-progress
This variable is normally @code{nil}, but the undo commands bind it to
@code{t}. This is so that various kinds of change hooks can tell when
they're being called for the sake of undoing.
@end defvar
@defun primitive-undo count list
This is the basic function for undoing elements of an undo list.
It undoes the first @var{count} elements of @var{list}, returning
......@@ -1256,6 +1262,8 @@ list value at the beginning of a sequence of undo operations. Then the
undo operations use and update the saved value. The new elements added
by undoing are not part of this saved value, so they don't interfere with
continuing to undo.
This function does not bind @code{undo-in-progress}.
@end defun
@node Maintaining Undo
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