Fixed TitleBg/TitleBgActive color being rendered above WindowBg color, being inconsistent and causing visual artefact (#655)
Fixed TitleBg/TitleBgActive color being rendered above WindowBg color, being inconsistent and causing visual artefact (#655)

Broke the meaning of TitleBg and TitleBgActive. Only affect values where
Alpha<1.0f. Fixed default theme.

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