[Cin] oops apparently 'subtract' mode is broken!

[Andrew Randrianasulu]

I was trying to repeat tuto at
https://linuxvideoediting.blogspot.com/2022/01/transparent-text-effect-in-Cinelerra-part1.html?m=1


so I loaded video, created empty new vid track, applied 'titles', 'blur'
and 'invert video' to _empty track_, then set track's mode to subtract ....
result was color inversion of original video on second vid track (
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