Scrolling page with arrow keys immediately after WR scroll bounce does not work

[samuknet]

The problem occurs immediately after the bounce effect that occurs when scrolling beyond top/bottom of a page. After the bounce, the page cannot be scrolled using keyboard input (up, down arrow keys) until the mouse has been used for a scroll.

To replicate:

• Load a page with a scroll - this one works well:

./mach run -d -w https://samuknet.github.io/test_cases/anchorInPage/index.html

• Scroll beyond the top of the page with the mouse wheel, causing the overscroll "bounce" effect.
• Scrolling with up/down arrow keys no longer works. To be able to scroll again with keyboard input, you must scroll using the scroll wheel first.

The issue does not occur with WR disabled.

[nox]

This still happens.