/usr/share/lintian/overrides/dia-common is in dia-common 0.97.3+git20160930-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # "dia" is provided by binary package dia which is usually available if dia-common is installed
dia-common: desktop-command-not-in-package usr/share/applications/dia.desktop dia
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