This file is indexed.

/usr/include/KF5/Akonadi/Contact/EmailAddressSelectionDialog is in libkf5akonadicontact-dev 4:15.12.3-0ubuntu1.

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

The actual contents of the file can be viewed below.

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#include "akonadi/contact/emailaddressselectiondialog.h"