WindowEvent { Focused } occurs after WindowEvent { MouseInput { Pressed } } on web backend

[rukai]

Heres a screenshot from running the web.rs example

The other backends return the window focus first and my application and https://github.com/rukai/winit_input_helper rely on this functionality.
The current handling in the web backend causes the first mouse click event to be lost.

[rukai]

Given that any click event should also result in a window focus event, I think the solution might be to generate an extra window focus event here like we already do for CursorMoved.

https://github.com/rust-windowing/winit/blob/7e0c6ee09757663efacd9d7ba7c70ff101ec4e35/src/platform_impl/web/event_loop/window_target.rs#L153+#L176