Support zero-sized display, now sets default as -1,-1 and assert if display size is negative.
Support zero-sized display, now sets default as -1,-1 and assert if display size is negative.

bagobor/imgui,mikesart/imgui,usagi/imguixx,ghassanpl/imgui,usagi/imguixx,emoon/imgui,nmlgc/imgui,ocornut/imgui,bkaradzic/imgui,tom-seddon/imgui,thevaber/imgui,benoitjacquier/imgui,GHF/imgui,tpoechtrager/imgui,seanmiddleditch/imgui,ocornut/imgui,Extrawurst/imgui,redblobgames/imgui,wflohry/imgui-addons,ghassanpl/imgui,ocornut/imgui,ggtucker/imgui,DXsmiley/FlexGUI,aimotive/imgui-glfw,Flix01/imgui,Pagghiu/imgui,ggtucker/imgui,rxantos/imgui,twigletguy/imgui,dougbinks/imgui,nProtect/imgui,wasikuss/imgui,wangshijin/imgui,twigletguy/imgui,thennequin/imgui,shaggytwodope/imgui,seanmiddleditch/imgui,luiseduardohdbackup/imgui,wangshijin/imgui,kylawl/imgui,xythobuz/imgui,xythobuz/imgui,kylawl/imgui,neshume/imgui,shaggytwodope/imgui,dougbinks/imgui,mikesart/imgui,cmaughan/imgui,gyakoo/imgui,nProtect/imgui,xunmengfeng/imgui,luiseduardohdbackup/imgui,redblobgames/imgui,gamedeff/imgui,bkaradzic/imgui,memononen/imgui,tpoechtrager/imgui,burningreggae/imgui,neshume/imgui,ggtucker/imgui,GHF/imgui,Flix01/imgui,aimotive/imgui-glfw,tom-seddon/imgui,wasikuss/imgui,gyakoo/imgui,gamedeff/imgui,Pagghiu/imgui,thennequin/imgui,bkaradzic/imgui,Psybrus/imgui,bagobor/imgui,nProtect/imgui,rxantos/imgui,andresv/imgui,Flix01/imgui,rmoorman/imgui,memononen/imgui,sakishum/imgui,benoitjacquier/imgui,burningreggae/imgui,Extrawurst/imgui,cmaughan/imgui,emoon/imgui,DXsmiley/FlexGUI,elect86/imgui,sakishum/imgui,Psybrus/imgui,cmaughan/imgui,elect86/imgui,nmlgc/imgui,zho7611/imgui,xunmengfeng/imgui,andresv/imgui,thevaber/imgui,rmoorman/imgui,wflohry/imgui-addons,zho7611/imgui,cmaughan/imgui