Currently GraphicsContext::fillRect(const FloatRect& rect) implementation uses ShadowBlur's beginShadowLayer/endShadowLayer functions to handle shadow drawing. These can get optimized by using drawRectShadow, however it seems that ShadowBlur's implementation is not taking in consideration Qt's current brush properties. This bug intends to implement full support of drawRectShadow() usage on fillRect function.
ShadowBlur will in drawShadowBuffer() set a new fillcolor which completely replaces the current brush with a new solid brush of that color. If part of the current brush properties are supposed to be preserved, maybe our implementation of setPlatformFillColor is reseting too much?
I noticed this comment in GraphicsContextCG: // Don't use ShadowBlur for canvas yet.
So perhaps tiled ShadowBlur is not yet ready for shadowsIgnoreTransforms, disabling it for canvas solves the regressions from bug #90082
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