| SetNextWindowPos: added a ImVec2 pivot parameter for positioning a given a center, bottom-right position, etc. As a generalization of SetNextWindowPosCenter() which is now obsolete.  This will be useful for combo-like popups as well. Demo: Simple-overlay window uses the SetWindowPos pivot to select a corner to position itself at. | 
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| imgui.cpp | 
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| imgui.h | 
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| imgui_demo.cpp | 
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| imgui_internal.h | 
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