Fix line-move-visual's following of column in R2L lines.
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.)
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