Fixed appending multiple times to an existing child via multiple calls to same BeginChild/EndChild
Fixed appending multiple times to an existing child via multiple calls to same BeginChild/EndChild

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