@kindex UP
@kindex DOWN
@findex beginning-of-line
-@findex end-of-line
+@findex move-end-of-line
@findex forward-char
@findex backward-char
@findex next-line
@item C-a
Move to the beginning of the line (@code{beginning-of-line}).
@item C-e
-Move to the end of the line (@code{end-of-line}).
+Move to the end of the line (@code{move-end-of-line}).
@item C-f
Move forward one character (@code{forward-char}). The right-arrow key
does the same thing.
@vindex undo-limit
@vindex undo-strong-limit
+@vindex undo-outer-limit
@cindex undo limit
When the undo information for a buffer becomes too large, Emacs
discards the oldest undo information from time to time (during garbage
collection). You can specify how much undo information to keep by
-setting two variables: @code{undo-limit} and @code{undo-strong-limit}.
-Their values are expressed in units of bytes of space.
+setting three variables: @code{undo-limit}, @code{undo-strong-limit},
+and @code{undo-outer-limit}. Their values are expressed in units of
+bytes of space.
The variable @code{undo-limit} sets a soft limit: Emacs keeps undo
-data for enough commands to reach this size, and perhaps exceed it, but
-does not keep data for any earlier commands beyond that. Its default
-value is 20000. The variable @code{undo-strong-limit} sets a stricter
-limit: the command which pushes the size past this amount is itself
-forgotten. Its default value is 30000.
-
- Regardless of the values of those variables, the most recent change is
-never discarded, so there is no danger that garbage collection occurring
-right after an unintentional large change might prevent you from undoing
-it.
+data for enough commands to reach this size, and perhaps exceed it,
+but does not keep data for any earlier commands beyond that. Its
+default value is 20000. The variable @code{undo-strong-limit} sets a
+stricter limit: a previous command (not the most recent one) which
+pushes the size past this amount is itself forgotten. The default
+value of @code{undo-strong-limit} is 30000.
+
+ Regardless of the values of those variables, the most recent change
+is never discarded unless it gets bigger than @code{undo-outer-limit}
+(normally 300,000). At that point, Emacs asks whether to discard the
+undo information even for the current command. (You also have the
+option of quitting.) So there is normally no danger that garbage
+collection occurring right after an unintentional large change might
+prevent you from undoing it. But if you didn't expect the command
+to create such large undo data, you can get rid of it and prevent
+Emacs from running out of memory.
The reason the @code{undo} command has two keys, @kbd{C-x u} and
@kbd{C-_}, set up to run it is that it is worthy of a single-character