Fix vertical cursor motion when the newline is covered by a display string.
src/indent.c (Fvertical_motion): Compute and apply the overshoot logic when moving up, not only when moving down. Fix the confusing name and values of the it_overshoot_expected variable; logic changes accordingly. (Bug#9254) (Bug#9549) src/xdisp.c (pos_visible_p): Produce correct pixel coordinates when CHARPOS is covered by a display string which includes newlines. (move_it_vertically_backward): Avoid inflooping when START_CHARPOS is covered by a display string with embedded newlines.
Showing with 233 additions and 49 deletions