19 Jul
2023
19 Jul
'23
8:47 a.m.
It is indeed invisible because the alpha channel is zero. But it does depend on default_visual.depth being 32 though. So if the screen depth is 24, then the pixel is black. I don't think 24 is common though.
I don't think it's that uncommon. And even if it's transparent it would still intercept the mouse. Most likely you want to use an empty window region instead.