[BUG] Item's with different size does not work as expected for swipeDirection vertical

[suhaiyl]

Describe the bug Item's with different size does not work as expected

To Reproduce

• try to set different preferred size for items
• Sample code
• preferredItemSize(CGSize(width: 300, height: self.page1.index % 2 == 0 ? 350 : 450))

Expected behavior A clear and concise description of what you expected to happen. The items should be loaded with size as expected

Screenshots / Videos If applicable, add screenshots to help explain your problem.

Environment:

• OSX: [e.g. iOS]
• Device [e.g. iPhone6]
  • SwiftUIPager version

Additional context Add any other context about the problem here.