Store inner_size
Store inner_size

In Winit, the Resize event has multiple purposes (actual resize,
screen change, workspace change, …). So we might get a Resize
event even if the window size hasn't changed yet. For example,
on MacOS, when going fullscreen.

Servo assume a resize and request a sync paint, which will freeze the
app. See:

https://github.com/servo/servo/blob/0fa324872330715140c86e5125640ef23e8b072b/components/compositing/compositor.rs#L1485

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