Fullscreen top banner timeout should not be reset by keyboard navigation
When in full screen there is a translucent banner over the top of the image. After not moving the mouse for a while this banner hides. Moving the mouse will bring it back, while navigating with the keyboard leaves it hidden.
However before it has hidden any keyboard navigation resets the timeout, and prevents it hiding. This means in a typical quick browsing use case it never hides, even when the mouse has not been touched for some time.
In this video it can be seen the top bar fades out within 5 seconds while no keyboard navigation is happening, but when keyboard navigating it doesn't fade out after 20 seconds.
Sometimes it does come back after hiding with just keyboard navigation as in the below video, though this may just be the lack of any mouse dead zone causing desk vibrations from keyboard use to very slightly move the mouse.
Keyboard navigation should not contribute to reshowing the top bar, and not reset the timeout.