This file is indexed.

/usr/include/X11/extensions/xf86dga1str.h is in x11proto-xf86dga-dev 2.1-3.

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

The actual contents of the file can be viewed below.

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#warning "xf86dga1str.h is obsolete and may be removed in the future."
#warning "include <X11/extensions/xf86dga1proto.h> for the protocol defines."
#include <X11/extensions/xf86dga1proto.h>