The issue here is that we are just repeatedly trying to move the pointer back to the center of the window, but we never really restrict the pointer within the window area. IIRC all desktop platforms provide some kind of mouse movement restriction API, for example on macOS we may use [`CGAssociateMouseAndMouseCursorPosition`](https://developer.apple.com/documentation/coregraphics/1454486-cgassociatemouseandmousecursorpo) to forbid the mouse cursor from being moved at all. We would probably need to hook onto those APIs in order to fix this issue.
Bug 853160 Comment 13 Edit History
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The issue here is that we are just repeatedly trying to move the pointer back to the center of the window, but we never really restrict the pointer within the window area. IIRC all desktop platforms provide some kind of mouse movement restriction API, for example on macOS we may use [`CGAssociateMouseAndMouseCursorPosition`](https://developer.apple.com/documentation/coregraphics/1454486-cgassociatemouseandmousecursorpo) to forbid the mouse cursor from being moved at all. We would probably need to hook those APIs in order to fix this issue.