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There are other ways that could happen, too, for example a chat window or a search bar.

Change your password asap.

And if you're running X: any window can just decide that it wants your keystrokes anyway.

Yes that's what I forgot to mention. Windows can steal focus and you could accidentally spill secrets into them

With X they don't even need to steal focus. They can just copy all the keystrokes. Wayland fixes this.