ImGuiListClipper: fixed automatic-height calc path dumbly having user display element 0 twice (#661, #716)
ImGuiListClipper: fixed automatic-height calc path dumbly having user display element 0 twice (#661, #716)

First bug out of two. Was easily visible using e.g. 50% alpha text.

cmaughan/imgui,Flix01/imgui,tom-seddon/imgui,cmaughan/imgui,Psybrus/imgui,dougbinks/imgui,Flix01/imgui,burningreggae/imgui,ggtucker/imgui,ggtucker/imgui,tom-seddon/imgui,wflohry/imgui-addons,aimotive/imgui-glfw,thennequin/imgui,ocornut/imgui,wasikuss/imgui,ocornut/imgui,cmaughan/imgui,thennequin/imgui,ggtucker/imgui,Pagghiu/imgui,dougbinks/imgui,bkaradzic/imgui,ocornut/imgui,nProtect/imgui,thevaber/imgui,elect86/imgui,bkaradzic/imgui,elect86/imgui,cmaughan/imgui,seanmiddleditch/imgui,usagi/imguixx,usagi/imguixx,nProtect/imgui,nProtect/imgui,Psybrus/imgui,thevaber/imgui,mikesart/imgui,wasikuss/imgui,burningreggae/imgui,wflohry/imgui-addons,aimotive/imgui-glfw,mikesart/imgui,seanmiddleditch/imgui,bkaradzic/imgui,Flix01/imgui,Pagghiu/imgui