bug of handling in invisible property at the beginning of line

[Kenichi Handa]

I got this bug report.

When you eval this,

(let ((str "123"))
  (put-text-property 0 (length str) 'invisible t str)
  (insert "abc\n" "def\n" str1 "ghi\n" "jkl\n"))

the buffer is displayed as below:
----------
abc
def
ghi
jkl
----------

When you move point to the first line and type C-a C-n C-n
C-n, the cursor moves on `a', `d', `f', `j'.  With Emacs 20,
it moves on `a', `d', `g', `j.  The latter seems to be the
correct behaviour.

---
Ken'ichi HANDA
address@hidden