bug#9034: point adjustment after `end-of-visual-line' moves to the next line

[Dmitry Kurochkin]

Package: emacs
Version: 24.0.50

If a line ends with invisible text, point adjustment moves to the next
line after `end-of-visual-line'.  To reproduce run:

  (progn (switch-to-buffer "test")
         (insert "aline1\nbline2\ncline3\n")
         (put-text-property 7 14 'invisible t) ; region [\nbline2]
         (goto-char (point-min)))

After that in the test buffer do M-: (progn (end-of-visual-line)
(point)).  `end-of-visual-line' moves point to position 14 as expected.
But after that the point is adjusted to position 15, as can be checked
by C-x =.

Sometimes the point is not adjusted to position 15 the first time you
run `end-of-visual-line'.  But it is if you run it more than once.
Perhaps it is related to the last point position.

It is definitely happens because of point adjustment, setting
global-disable-point-adjustment to non-nil fixes the problem.

Also, `move-end-of-line` always behaves correctly, so it it something
specific to `end-of-visual-line' or `vertical-motion'.

The issue was originally reported on the emacs-devel ML [1].

Regards,
  Dmitry

[1] http://lists.gnu.org/archive/html/emacs-devel/2011-07/msg00255.html