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(Managing Overlays): Document overlay-recenter.

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This commit is contained in:
Richard M. Stallman 2006-11-06 16:08:35 +00:00
parent 4071cac7eb
commit 7525356bc3
1 changed files with 15 additions and 0 deletions
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15
lispref/display.texi
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@ -1259,6 +1259,21 @@ foo
@result{} t
@end example
Emacs stores the overlays of each buffer in two lists, divided
around an arbitrary ``center position.'' One list extends backwards
through the buffer from that center position, and the other extends
forwards from that center position. The center position can be anywhere
in the buffer.
@defun overlay-recenter pos
This function recenters the overlays of the current buffer around
position @var{pos}. That makes overlay lookup faster for positions
near @var{pos}, but slower for positions far away from @var{pos}.
@end defun
A loop that scans the buffer forwards, creating overlays, can run
faster if you do @code{(overlay-recenter (point-max))} first.
@node Overlay Properties
@subsection Overlay Properties