When the animation hides the quick return element and the first list item is not at the top of the screen you can see the placeholder element.
Steps to reproduce:
Start example app.
Scroll up until half the word, "Android" in the first list item is no longer visible.
Scroll down, allowing the quick return to slide down, continuing until again the first list item is half covered.
Scroll up slightly.
The placeholder element in the header is now visible and selectable. My thinking is the quick return should only slide up until its bottom edge hits the top edge of the first list item.
When the animation hides the quick return element and the first list item is not at the top of the screen you can see the placeholder element.
Steps to reproduce:
The placeholder element in the header is now visible and selectable. My thinking is the quick return should only slide up until its bottom edge hits the top edge of the first list item.
Video