Speed up vertical-motion when screen coordinates are known
src/indent.c (Fvertical_motion): Accept an additional argument CUR-COL and use it as the starting screen coordinate. src/window.c (window_scroll_line_based, Fmove_to_window_line): All callers of vertical-motion changed. doc/lispref/positions.texi (Screen Lines): Update the documentation of vertical-motion to document the new additional argument.
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