Fix line-move-visual's following of column in R2L lines (backport from trunk).
src/simple.el (line-move-visual): When converting X pixel coordinate
to temporary-goal-column, adjust the value for right-to-left
screen lines. This fixes vertical-motion, next/prev-line, etc.
src/dispnew.c (buffer_posn_from_coords): Fix the value of the column
returned for right-to-left screen lines. (Before the change on
2014-12-30, the incorrectly-computed X pixel coordinate concealed
this bug.)
(cherry picked from commit
5fbd17e369ca30a47ab8a2eda0b2f2ea9b690bb4)
Conflicts:
lisp/simple.el