The QT_FONT_DPI environment variable is now supported cross-platform, for the purpose of developing and testing with specific DPI values.Replaces QT_AUTO_SCREEN_SCALE_FACTOR (now deprecated), and corresponds to the Qt::AA_EnableHighDpiScaling application attribute. Added the QT_ENABLE_HIGHDPI_SCALING environment variable which enables high-dpi scaling based on display DPI.Use QGuiApplication::highDpiScaleFactorRoundingPolicy or QT_SCALE_FACTOR_ROUNDING_POLICY to set the rounding policy. Applications can now opt-in to use non-integer scale factors, for example Windows at 150%.QColorConstants provide constexpr QColor instances that don't cost any runtime overhead. it's possible to move the Qt installation without breaking functionality or loading of plugins. Back-ends to implement the Gregorian, Jalali (Persian), Islamic Civil, Milankovic, and Julian calendars.QCalendar adds support for Calendars other than Gregorian, by implementation of suitable back-ends.Ability to have multiple manufacturer data per manufacturer ID. QLowEnergåontroller: Introduce AuthorizationError.Backend is not built by default and not part of the prebuild packages though.
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