This is the definition of `add-to-invisibility-spec':
(defun add-to-invisibility-spec (element)
"..."
(if (eq buffer-invisibility-spec t)
(setq buffer-invisibility-spec (list t)))
(setq buffer-invisibility-spec
(cons element buffer-invisibility-spec)))
This is what it should be:
(defun add-to-invisibility-spec (element)
"..."
(if (eq buffer-invisibility-spec t)
(setq buffer-invisibility-spec (list t)))
(add-to-list 'buffer-invisibility-spec element))
Multiple elements should not be introduced. They serve no purpose, and
could complicate code that manipulates `buffer-invisibility-spec'. In any
case, `buffer-invisibility-spec' is not likely to be extremely long, so
nothing is gained by not preventing duplicates.
In GNU Emacs 22.1.50.1 (i386-mingw-nt5.1.2600)
of 2007-05-22 on LENNART-69DE564
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --cflags -Ic:/g/include'
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