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           Docking: Some DockBuilder functions are applied on settings data if windows are not present. Added DockBuilderCreateNode which needs a size else if we can't split properly. DockNodeTreeSplit() doesn't clamp SizeRef. (+1 squashed commits) 
          
          
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| imgui.cpp | 
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| imgui_internal.h | 
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| imgui_widgets.cpp | 
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