ColorSpace -> Colorspace. I kept typing it wrong, so even though I usually say color...

[movit] / mix_effect.frag

vec4 FUNCNAME(vec2 tc) {
        vec4 first = INPUT1(tc);
        vec4 second = INPUT2(tc);
        return vec4(PREFIX(strength_first)) * first + vec4(PREFIX(strength_second)) * second;
}