Set next window position.
pos
Position in absolute screen coordinates, in pixels.
cond
ImGuiCond controlling when the state is applied; 0 means always.
pivot
Normalized anchor within the window: (0,0) is top-left and (0.5,0.5) centers it on pos.
call before Begin().
use pivot=(0.5,0.5) to center on given point, etc.
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Set next window position.