/usr/share/ldm/rc.d/X52-xcompmgr is in ldm 2:2.2.13-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # Turn on compositing to improve performance and lower bandwidth usage
if boolean_is_true "$LDM_XCOMPMGR" && [ -n "$(which xcompmgr)" ]; then
xcompmgr -a&
fi
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