=== RUN DF-1818 2026-07-20T18:44:52Z ===
DF-1818: fill_rect24 slow path (sckmsrndr.c:437-446)
  width=6 height=768 line_width=4096  d=4078 (per-row padding)
  BUGGY (+=line_width at :445): final draw_pos=3159552, 13824 bytes PAST fb end
  FIXED (+=d):                 final draw_pos=3145728, 0 bytes past fb end
  Per-row drift = 3*width = 18 bytes; total drift = (height-1)*3*width = 13806 bytes
[exit=0]