23.0.60; Crash on w32 related to invisible text

[Lennart Borgman (gmail)]

I get crashes in org-mode when I do things in a region with invisible
text. I have not made any simple test case, but from my testing I can 
see this:

- There is something strange with the display in org-mode an items 
content is hidden. You can position point after the three dots ... If 
you do that and check (current-column) you get 0.

- In code if you in org-mode do

(while (my-invisible-p (point))
  (forward-line 1))

until point is on a visible char and there insert an overlay with an 
'after-string it crashes.


In GNU Emacs 23.0.60.1 (i386-mingw-nt5.1.2600)
 of 2008-03-21
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --no-opt --cflags
-Ic:/g/include -fno-crossjumping'