XGetInputFocus returned the focused window of 1. This is likely a bug in the X server.

[ygm521]

ubuntu18.04

[FascinatedBox]

Ignore xdotool: This is not an bug in X. See here:

https://tronche.com/gui/x/xlib/input/XSetInputFocus.html

To summarize the above: Asking for input focus can return three different possibilities: A window that has focus, None (0x0), or PointerRoot (0x1). The latter indicates that the current window is the root window of the screen the mouse is currently on.