Qtile hook to center all floating windows, until more sensible defaults or a better solution are available

center_window.py

@hook.subscribe.float_change
def center_window():
    client = qtile.current_window
    if not client.floating:
        return

    screen_rect = qtile.current_screen.get_rect()

    center_x = screen_rect.x + screen_rect.width / 2
    center_y = screen_rect.y + screen_rect.height / 2

    x = center_x - client.width / 2
    y = center_y - client.height / 2
        
    # don't go off the right...
    x = min(x, screen_rect.x + screen_rect.width - client.width)
    # or left...
    x = max(x, screen_rect.x)
    # or bottom...
    y = min(y, screen_rect.y + screen_rect.height - client.height)
    # or top
    y = max(y, screen_rect.y)
    
    client.x = int(round(x))
    client.y = int(round(y))
    qtile.current_group.layout_all()

Thank you so much for this! I use it in my config across all machines, works beautifully.

However I encountered a small problem with it when trying to fullscreen YouTube videos (for example) in a browser. It would maximize the video, but the bar would not hide, e.g. not completely fullscreen.
From my understanding a fullscreen video is also floating, which meant that the hook to center floating windows was interfering.

So on line 4 I did a very small adjustment to check if the window is fullscreening:

if not client.floating or client.fullscreen:
        return

Now fullscreen videos work properly and floating videos get centered as they should.
I am not a programmer by trade so I don't know if there is a better solution, but maybe this helps someone.