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QString::arg() replaces %1 first, so using %2 with a single argument triggered a Qt warning. Works by accident (Qt falls back to lowest available placeholder) but is incorrect.
…lable qBound(0, x, -1) returns 0 when nbScreens is 0, then screens.at(0) crashes on the empty list. Early return when no screens are detected.
delete nullptr is a no-op in C++, so the null check is unnecessary.
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