Re: [fxtf-drafts] [filters-effects] Allow nesting filters instead of using 'in', 'in2' and 'result' attributes

@SebastianZ It might get nasty but still a nice idea. However, `in`, `in2`, `result` are widely implemented and more powerful since you can partly reuse filter primitives or create multiple trees and switch between them with `<set>`.

We could keep this issue around as a proposal for level 2 of the spec but I do not see a chance that this makes it into a future level of the spec either.

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