Hi Vlad,
you are right – due to the changes of the underlying renderer from Cocos2d-x to Qt 5, the new SpriteSequenceVPlay and SpriteVPlay components do not have mirror properties yet.
You can add this functionality yourself similar to this code (given that you added a property bool mirrorY to your SpriteSequenceVPlay instance that you want to mirror):
transform: [
// at first scale around 0/0, then move it back up if mirrorY is set to true; otherwise do nothing
Scale { xScale: 1; yScale: mirrorY ? -1 : 1 },
Translate { y: mirrorY ? spriteSequenceVPlay.height : 0}
]
Cheers, Chris