Fix 'vertical-motion' and 'posn-at-point' under 'visual-line-mode'
* src/xdisp.c (move_it_in_display_line_to): Don't assume we can wrap on a whitespace character if it's followed by another whitespace character. When returning under WORD_WRAP for a screen line that is continued, restore to wrap point when atpos/atx position would be displayed on the next screen line due to line-wrap. (Bug#23570)
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