/usr/share/xfce4/panel-plugins/linelight.desktop is in xfce4-linelight-plugin 0.1.7-4build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Type=X-XFCE-PanelPlugin
Encoding=UTF-8
Name=Linelight
Comment=A simple fronted for the locate search.
Icon=xfce4-linelight-plugin
X-XFCE-Exec=/usr/lib/x86_64-linux-gnu/xfce4/panel-plugins/xfce4-linelight-plugin
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