Don't call sit-for in right-char and left-char for visual cursor motion.
src/xdisp.c (Fmove_point_visually): Invalidate the cursor position when moving point by using the current glyph matrix. This avoids the need to force redisplay when this function is called in a loop. lisp/bindings.el (right-char, left-char): Don't call sit-for, this is no longer needed. Use arithmetic comparison only for numerical arguments.
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