Timestamp fixes for undo.

[bpt/emacs.git] / doc / lispref / text.texi

diff --git a/doc/lispref/text.texi b/doc/lispref/text.texi
index c10458b..7cace70 100644 (file)
--- a/doc/lispref/text.texi
+++ b/doc/lispref/text.texi
@@ -1250,14 +1250,18 @@ reinsert it is @code{(abs @var{position})}.  If @var{position} is
 positive, point was at the beginning of the deleted text, otherwise it
 was at the end.
 
 positive, point was at the beginning of the deleted text, otherwise it
 was at the end.
 

-@item (t @var{sec-high} @var{sec-low} @var{microsec} @var{picosec})
+@item (t . @var{time-flag})

 This kind of element indicates that an unmodified buffer became
 This kind of element indicates that an unmodified buffer became

-modified.  The list @code{(@var{sec-high} @var{sec-low} @var{microsec}
+modified.  A @var{time-flag} of the form
+@code{(@var{sec-high} @var{sec-low} @var{microsec}

 @var{picosec})} represents the visited file's modification time as of
 when it was previously visited or saved, using the same format as
 @var{picosec})} represents the visited file's modification time as of
 when it was previously visited or saved, using the same format as

-@code{current-time}; see @ref{Time of Day}.  @code{primitive-undo} uses those
+@code{current-time}; see @ref{Time of Day}.
+A @var{time-flag} of 0 means the buffer does not correspond to any file;
+@minus{}1 means the visited file previously did not exist.
+@code{primitive-undo} uses these

 values to determine whether to mark the buffer as unmodified once again;
 values to determine whether to mark the buffer as unmodified once again;

-it does so only if the file's modification time matches those numbers.
+it does so only if the file's status matches that of @var{time-flag}.

 
 @item (nil @var{property} @var{value} @var{beg} . @var{end})
 This kind of element records a change in a text property.
 
 @item (nil @var{property} @var{value} @var{beg} . @var{end})
 This kind of element records a change in a text property.