Fix modulation propagation for Y-sorted CanvasItems #77079
Merged
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There was already
RendererCanvasCull::Item.ysort_modulate
but... currently it was never set/used 🙃 (likely overlooked in 4.0 rewriting). This PR is pretty much redoing what was done when it was originally added in #30318 (separately stores and applies the modulation for each item within the branches flattened due to Y-sorting).Fixes #63994 (actual cause of the other issues).
Fixes #72519.
Fixes #73266.
(tested MRPs from all of these)