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Bug
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    Resolution: Fixed
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P1: Critical
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    5.15.10, 6.4.2, 6.5.0 FF
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    None
 
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        bf0f1fa7d (dev), 87fdd0cf8 (6.5)
 
The background of the splash screen is not transparent, although it is set to transparent in the respective QML file.
Reproduce:
Open "QtQuick Example - Window and Screen". Compile and run.
Result: 
Windows: The splash screen has a white background (see image below).
Linux without Compositor: The splash screen has a black background. With a compositor it's transparent as it should be.
MacOS (5.15 and 6.5): The splash screen has a white background.
MacOS (5.12): As expected result (not affected).
Expected result:
The splash screen should not have a white background.

- is duplicated by
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QTBUG-112537 A Window's background cannot be semitransparent anymore
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     - Closed
 
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- relates to
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QTBUG-95428 macOS: Top Level Transparent Window Regression Since 5.15 onwards - QML
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 - Closed
 
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QTBUG-100460 macOS: Splash screen looses Transparency
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 - Closed
 
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QTBUG-112537 A Window's background cannot be semitransparent anymore
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     - Closed
 
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QTBUG-109603 Window transparency doesn't work
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 - Closed
 
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QTBUG-115015 [REG 5.15.14->6.5.1]: Qt6 QML component Window setting property color: "transparent" doesn't make the Window transparent for Windows 11 and MacOS
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 - Closed
 
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QTBUG-52494 QML SplashScreen not transparent On Windows 7
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 - Closed
 
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