ClientHeight() dosen't return correct value

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Space Fractal(Posted 2006) [#1]
I have a problem with ClientHeight(), wich return a higher value as it should. How can I set a new window position (using user32), without using width and hieght cords (like SetWindow hWND,x,y)?

Here is the code, that reproduce the bug:

A workaround was to make a purebasic dll function and reposition that window. In the purebasic dll connected it to user32.dll with SetWindowPos function.