Don't cache /ExtGState entries that contain fonts (PR 12087 follow-up)
Don't cache /ExtGState entries that contain fonts (PR 12087 follow-up)

I completely overlooked the fact that `PartialEvaluator.handleSetFont` also updates the current `state`, which means that currently we're not actually handling font data correctly for cached /ExtGState data. (Thankfully, using /ExtGState to set a font is somewhat rare in practice.)

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