(gap_left, gap_right): Put an anchor `\0' at the end of GAP. (adjust_markers_for_insert): If any markers are adjusted, check and fix the order of overlays in overlays_before. (make_gap): Allocate an extra byte and set to `\0' for anchoring. (insert1, insert_from_buffer_1): Put an anchor `\0' at the head of GAP.
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