This file is indexed.

/usr/bin/marco-no-composite is in mate-tweak 3.5.10-1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/usr/bin/env bash

WM=marco

if [ ! -x $(which ${WM}) ]; then
    echo "ERROR! Can't find ${WM}."
    exit 1
fi

# Replace window manager and force compositing off.
${WM} --no-composite --replace &