Commit 60d3008e authored by Glenn Morris's avatar Glenn Morris
Browse files

More info on how to replace make-variable-frame-local.

parent ce8fc80b
......@@ -135,7 +135,15 @@ because they clash with commands provided by dirtrack.el. Use
* Lisp Changes in Emacs 22.2.
** Frame-local variables are deprecated and are slated for removal.
Use frame parameters instead.
They can easily be emulated. Rather than calling `make-variable-frame-local'
and accessing the variable value directly, explicitly check for a
frame-parameter, and if there is one, use its value in preference to
that of the variable. Eg:
(let ((fp (assoc 'var (frame-parameters))))
;; Use frame-parameter, even if nil.
(if fp (cdr fp)
;; Else use normal variable value.
** The function invisible-p returns non-nil if the character
after a specified position is invisible.
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