update_slide_size.swift

private func updateSlideSize() {
        
        guard let fieldRect = self.rects[editingField] else {
            slideSize = .zero
            slideSizePublisher.send(.zero)
            return
        }
        
        guard keyboardRect != .zero else {
            slideSize = .zero
            slideSizePublisher.send(.zero)
            return
        }
        
        let diff = fieldRect.maxY - keyboardRect.minY + 48
    
        if keyboardRect.minY < fieldRect.maxY + 48 {
             slideSize = CGSize(width: 0, height: -diff)
             slideSizePublisher.send(CGSize(width: 0, height: -diff))
        } else {
            slideSize = .zero
            slideSizePublisher.send(.zero)
        }
    }