Fix signed types warning in pasteboard handler (#2786)
Fix signed types warning in pasteboard handler (#2786)


ocornut/imgui,Flix01/imgui,nProtect/imgui,ggtucker/imgui,cmaughan/imgui,bkaradzic/imgui,burningreggae/imgui,nProtect/imgui,ocornut/imgui,cmaughan/imgui,burningreggae/imgui,Flix01/imgui,aimotive/imgui-glfw,ocornut/imgui,dougbinks/imgui,bkaradzic/imgui,bkaradzic/imgui,cmaughan/imgui,ggtucker/imgui,dougbinks/imgui,aimotive/imgui-glfw,Flix01/imgui,cmaughan/imgui,ggtucker/imgui,nProtect/imgui