Is there a function (or any method) that can tell me the left space available 
for an already maped top level window (parent is root window) ?

The method for new top level window are possible: set the value of width and 
height very high then the window manager will reduce it automatically when 
For instance when I set 768 as height, the window manager will reduce it to 700 
(I use getgeometry). In fact the window/desktop manager reduces the size 
because of existence of title bar, decoration, and some menu bar.

I can not do this method for a maped window, do you know any solution ?

Thank you

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