wallpapers/image: set duration to 1 to avoid flickering
If asynchronous is set to true, the exact moment Image.status becomes Image.Ready, the image doesn't really show up in the window.
To verify the behavior, run qml main.qml in the attachment and click the window area (will switch between the two images), see if every time the color of rectangle shows up before the image.
Reproducible on both Qt6.3.1 and Qt5.15.5 using https://fars.ee/AVAv.gz or main.qml
Edited by Fushan Wen