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(Maintaining Undo): Add `undo-outer-limit'.

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Luc Teirlinck 2005-01-31 23:31:21 +00:00
parent e15db17409
commit 578e484b9e
1 changed files with 14 additions and 7 deletions
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21
lispref/text.texi
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@ -1321,20 +1321,27 @@ preferred name is @code{buffer-disable-undo}.
them from using up all available memory space, garbage collection trims
them back to size limits you can set. (For this purpose, the ``size''
of an undo list measures the cons cells that make up the list, plus the
strings of deleted text.) Two variables control the range of acceptable
sizes: @code{undo-limit} and @code{undo-strong-limit}.
strings of deleted text.) Three variables control the range of acceptable
sizes: @code{undo-limit}, @code{undo-strong-limit} and
@code{undo-outer-limit}.
@defvar undo-limit
@defopt undo-limit
This is the soft limit for the acceptable size of an undo list. The
change group at which this size is exceeded is the last one kept.
@end defvar
@end defopt
@defvar undo-strong-limit
@defopt undo-strong-limit
This is the upper limit for the acceptable size of an undo list. The
change group at which this size is exceeded is discarded itself (along
with all older change groups). There is one exception: the very latest
change group is never discarded no matter how big it is.
@end defvar
change group is only discarded if it exceeds @code{undo-outer-limit}.
@end defopt
@defopt undo-outer-limit
If at garbage collection time the undo info for the current command
exceeds this limit, Emacs discards the info and prints a warning
message. This is a last ditch limit to prevent memory overflow.
@end defopt
@node Filling
@comment node-name, next, previous, up