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Fetch per-instruction opcode bytes alongside the disasm listing and show
them in a column between the address and the mnemonic. Instruction length
comes from consecutive addresses (variable-length safe: x86 movabs shows
its full 10 bytes); the block over-fetches one instruction for the last
line's boundary, falling back to the function end for the final insn.
The column pads to the widest instruction across the whole function:
_fetch_block tracks a running max, and on load a background scan_bytes()
settles a stable width so padding doesn't jump as blocks stream in.
_op_field is shared by the rendered strip, _line_plain, and search _fmt
so cursor/match offsets stay aligned. 'o' toggles the column.
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