This file is indexed.

/etc/X11/Xsession.d/60x11-common_localhost is in x11-common 1:7.6+12ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# This file is sourced by Xsession(5), not executed.

[ -x /usr/bin/xhost ] && [ -x /usr/bin/id ] &&
    xhost +si:localuser:`id -un` > /dev/null