This file is indexed.

/usr/share/kwin/shaders/1.10/coverswitch-reflection.glsl is in kwin-data 4:5.5.5-0ubuntu1.

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

The actual contents of the file can be viewed below.

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uniform vec4 u_frontColor;
uniform vec4 u_backColor;

varying vec2 varyingTexCoords;

void main()
{
    gl_FragColor = u_frontColor*(1.0-varyingTexCoords.s) + u_backColor*varyingTexCoords.s;
}