This file is indexed.

/usr/share/meshlab/shaders/decorate_shadow/sm/depth.frag is in meshlab 1.3.2+dfsg1-2+b1.

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

The actual contents of the file can be viewed below.

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void main(void)
{
   gl_FragColor = vec4(gl_FragCoord.z);
}