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    It isn't entirely clear to me how your question relates to the open/closed principle but you can remove your coupling of WelcomePage to userData by injecting the AboutDialog (or a factory/strategy to create the AboutDialog) into WelcomePage instead of injecting the userData. Commented Nov 27, 2019 at 11:01
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    "Isn't disallowing global state results in more coupling here?" No, there is exactly the same amount of coupling. But with DI you can see it Commented Nov 27, 2019 at 13:16
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    Instead of proposing a cage match between competing software principles, ask yourself, "What makes the most sense to do here? Commented Nov 27, 2019 at 15:10