in reply to Center a Tk window under mouse cursor
I might be 100% wrong here, but the way I understand things, the location of the mouse can only be reported to the GUI after it has been rendered, i.e. after MainLoop is running. What most GUI do to achieve this, is actually move the mouse to the center of the window after it loads. To get it otherwise means you need to ask the OS/WM to tell you where the mouse is at loading time.
Stop saying 'script'. Stop saying 'line-noise'.
We have nothing to lose but our metaphors.
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