/usr/share/doc/gnat-gps/html/Compare-against-revision.html is in gnat-gps-doc 5.0-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | <meta http-equiv="refresh" content="0; url=The-Version-Control-Contextual-Menu.html#Compare%20against%20revision">
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