This file is indexed.

/usr/lib/ubuntu-mate/ubuntu-mate-settings-overlay is in ubuntu-mate-default-settings 18.04.17.

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

function autostart_clean() {
    FILENAME="${1}"
    if [ -e "/usr/share/mate/autostart/${FILENAME}" ] && [ -e "${HOME}/.config/autostart/${FILENAME}" ]; then
        rm -f "${HOME}/.config/autostart/${FILENAME}"
    fi
}

function overlay_file() {
    local SYSTEM_FILE="/usr/share/ubuntu-mate/settings-overlay/${1}"
    local USER_FILE="${HOME}/.${1}"
    local USER_DIR=$(dirname "${USER_FILE}")

    # If the file doesn't exist or is zero-bytes then overlay the
    # configuration.
    if [ ! -f "${USER_FILE}" ] || [ ! -s "${USER_FILE}" ]; then
        mkdir -p "${USER_DIR}"
        cp "${SYSTEM_FILE}" "${USER_FILE}"
    fi
}

if [ ! -d "${HOME}/.config/plank/dock1" ]; then
    overlay_file config/plank/dock1/launchers/clock.dockitem
    overlay_file config/plank/dock1/launchers/desktop.dockitem
    overlay_file config/plank/dock1/launchers/firefox.dockitem
    overlay_file config/plank/dock1/launchers/caja.dockitem
    overlay_file config/plank/dock1/launchers/matecc.dockitem
fi
overlay_file config/folder-color/hide_donation
overlay_file config/smplayer/smplayer.ini
overlay_file config/tilda/config_0
overlay_file config/Trolltech.conf

# Now that indicators and HUD are enabled by default at the system
# level, any duplicate local autostart files can be removed.
autostart_clean indicator-application.desktop
autostart_clean indicator-sound.desktop
autostart_clean indicator-messages.desktop
autostart_clean indicator-power.desktop
autostart_clean indicator-session.desktop
autostart_clean mate-hud.desktop
autostart_clean ubuntu-mate-welcome.desktop