Why is it impossible to move a window programmatically in GTK+ (C/C++)

[Tarie Nosworthy via gtk-app-devel-list]

I am writing an app in GTK+, and I wanted to center a splash screen.  Coming 
from a Windows background, where SetWindowPos does the job, I found out the X 
Window Manager always ignores requests to move a window, therefore eventually 
denying any attempt to manipulative the position of a window.  I can resize it, 
even dynamically, and I can move it with the mouse, but never in code.  Why?  
It seems very strange that GTK would just disallow it.  You have gravity 
properties, but not matter what gravity I set, the position NEVER changes.  Why 
have the APIs if GTK is free to ignore them.  I'm baffled by it.  
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