bug#3494: 23.0.94; line-move-visual: temporary goal column confused by hscrolling

[Chong Yidong]

>  1. xrdb -remove; xterm -geometry 80x25
>  2. emacs -Q -nw -f toggle-truncate-lines -f column-number-mode
>  3. C-u 85 a RET
>     C-u 100 b RET
>  4. Press C-p two times to move the the beginning of "a" line.
>  5. Press C-e to get to the end of "a" line. (See screenshot 1.)
>  6. Press C-x C-n and "y" to set goal column.
>  7. Press C-n. The screen is scrolled horizontally and the cursor at the
>     column 94. (See screenshot 2.)

I see the problem.  It's not trivial to fix; maybe it's preferable for
`line-move' to call `line-move-1' instead of `line-move-visual' when the
window is hscrolled.

Stefan, WDYT?