in Diffusion/Common/Pipeline/Pipeline.swift [23:31]
init(progress: StableDiffusionPipeline.Progress, previewIndices: [Bool]) {
self.progress = progress
self.currentImages = [nil]
// Since currentImages is a computed property, only access the preview image if necessary
if progress.step < previewIndices.count, previewIndices[progress.step] {
self.currentImages = progress.currentImages
}
}