It's not. Wayland has a similar primary selection mechanism, and has the same problem. Firefox tells (X11|Wayland) that the text is selected, so that's what get

It's not. Wayland has a similar primary selection mechanism, and has the same problem. Firefox tells (X11|Wayland) that the text is selected, so that's what gets pasted, because that's how the entire thing works. The article even mentions this.