Following changes in #524 , I'm facing an issue where in fullscreen mode the top window bar appears when I scroll to the top of the screen (similarly, the taskbar appears if I scroll to the bottom). This used to not happen with extension-managed fullscreen mode (at least I'm fairly certain as it gets in the way of my point-to-click games where scrolling to the side to pan the map is a fairly common thing to do).
I can't seem to find any settings to turn this behaviour off.
(I think this only happens in cases where the mouse locking is off as per #518 as turning on mouse-capture effectively fixes the mouse position in-place as far as Chrome OS is concerned)