In a LaTeX document, write something like
and this depends on $x$ and $y$ MORE TEXT MORE TEXT MORE TEXT MORE
TEXT MORE TEXT MORE TEXT MORE TEXT MORE TEXT
preview, say using C-c C-p C-d (or C-c C-p C-p). Now move the cursor
to the $ just after x and type C-d a few times and then a comma,
obtaining
and this depends on $x, y$ MORE TEXT MORE TEXT MORE TEXT MORE
TEXT MORE TEXT MORE TEXT MORE TEXT MORE TEXT
with the cursor someplace around the comma. Notice that there are two
preview-generated pictures around [can't really tell what they are
supposed to represent, too small for my eye sight], which is annoying
but understandable. If I type C-c C-p C-p now, everything after the
$x,y$ disappears from the display! Very disconcerting, especially the
first time it happens. C-c C-p C-d makes everything peachy again.
That's recent snapshot AUCTeX (but noticed the same problem a few
months ago) and CVS Emacs.
--Boris
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