This file is indexed.

/usr/share/kde4/apps/kwin/blinking-startup-fragment.glsl is in kde-window-manager-common 4:4.8.5-0ubuntu0.4.

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

The actual contents of the file can be viewed below.

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uniform sampler2D sampler;
uniform vec4 u_color;

varying vec2 varyingTexCoords;

void main()
{
    vec4 tex = texture2D(sampler, varyingTexCoords);
    if (tex.a != 1.0) {
        tex = u_color;
    }
    gl_FragColor = tex;
}