This file is indexed.

/lib/systemd/system/xdm.service is in xdm 1:1.1.11-3.

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

The actual contents of the file can be viewed below.

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[Unit]
Description=X-Window Display Manager
After=systemd-user-sessions.service

[Service]
# temporary safety check until all DMs are converted to correct
# display-manager.service symlink handling
ExecStartPre=/bin/sh -c '[ "$(cat /etc/X11/default-display-manager 2>/dev/null)" = "/usr/bin/xdm" ]'
ExecStart=/usr/bin/xdm -nodaemon