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Commits:
2248487c6ca9d5459c70a16868d5aeee07d96157 (qt/qtbase/dev) 77659e03393820daace991c28021cfb8b67f871a (qt/qtbase/6.2)

There are a couple of ways that we're checking which system theme is in use:

Having a QPA API for this would be much better.

We could do this by adding e.g. a SystemTheme enum to QPlatformTheme:

enum SystemTheme {
    DarkTheme,
    LightTheme,
    OtherTheme
};

is required for

QTBUG-74210 It would be nice if there is an api to detect what mode is active (Dark/light)

relates to

QTBUG-68850 Qt Applications are not usable under macOS Mojave with dark theme

QTBUG-83908 Material.System does not work on Windows 10 in Dark Mode

QTBUG-93815 Dark mode does not work when theme Material.System is used

QTBUG-93955 Material.System does not work on Ubuntu (Gnome)

QTBUG-72028 Add support for Windows dark mode

QTBUG-78913 Material.System should follow system theme on Android Q and up

QTBUG-97910 Support runtime theme switching

QTBUG-88043 Event informing that the device has switched to Night(Dark) mode or vice versa

(4 relates to)

For Gerrit Dashboard: QTBUG-94859
#	Subject	Branch	Project	Status	CR	V
357256,10	Add QPlatformTheme::Appearance for detecting light/dark modes	dev	qt/qtbase	Status: MERGED	+2	0
357262,7	QWindowsTheme: implement appearance()	dev	qt/qtbase	Status: ABANDONED	0	0
357787,1	QQuickStyle: use systemTheme() to detect dark mode	dev	qt/qtquickcontrols2	Status: ABANDONED	0	0
367559,3	QQuickStyle: use systemTheme() to detect dark mode	dev	qt/qtdeclarative	Status: MERGED	+2	0
367622,4	macOS: Use new QPlatformTheme::appearance() function	dev	qt/qtbase	Status: MERGED	+2	0
375647,2	QQuickStyle: use systemTheme() to detect dark mode	6.2	qt/qtdeclarative	Status: MERGED	+2	0
375648,2	Add QPlatformTheme::Appearance for detecting light/dark modes	6.2	qt/qtbase	Status: MERGED	+2	0
375649,2	macOS: Use new QPlatformTheme::appearance() function	6.2	qt/qtbase	Status: MERGED	+2	0