Some GEGL filters clip to layer to image size no matter what
Examples
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When two dropshadows are chained the bottom one will clip
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Cubism always clips in default
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Noise spread clips the filter below it
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Drop Shadow will even clip filters that are above it
I mistakenly though this problem had to do with gegl:crop and frantically removed every trace of gegl:crop from my plugins. Now I realize it isn't the only culprit and the problem is more complex.