When I resize a Qt Quick ApplicationWindow that contains a Frame with an InnerShadow, I see flickering and visual artifacts. The same is not true when I either do not replace the default border or if I use a simple rectangle for the Frame object.
Tested this on my laptop that runs a 64-bit Arch Linux,Nvidia GTX 1060 Max Q graphics card and an integrated Intel graphics card. Ran the sample code both with and without bumblebee. Tried setting AA_ShareOpenGLContexts and AA_UseOpenGLES (and its software/desktop variants) attributes with no luck.