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4924555d6d
The issue here is that we end up with a transition between mismatched
transform lists that ends up generating an InterpolateMatrix {}
operation. So far so good, but we end up interpolating that a lot of
times and generating an unboundedly-deep operation list.
This implementas an optimization that flattens them to a single matrix
when possible (when there's no dependencies on the containing box).
This is similar to:
2b89cc4df4
We fix the to_pixel_length() behavior for LenghtPercentage to be
correct (and update callers to preserve behavior).
Differential Revision: https://phabricator.services.mozilla.com/D134784