Lose document when rotating from landscape to portrait and back

[jdelman]

When rotating between landscape/portrait, you can lose your open document and position. I have encountered this issue on an iPhone XS Max running iOS 12.3.1.

Steps to recreate:

• Search for something.
• View an article.
• Rotate into landscape mode (on my iPhone XS Max, this shows the search view and the document view side-by-side)
• Rotate back to portrait

Expected behavior: Show the document view

Actual behavior: Shows the search view