Made paintContainerBackground() in windows/container.c respect the clip rect.
Made paintContainerBackground() in windows/container.c respect the clip rect.

sclukey/libui,ProtonMail/libui,tbodt/libui,ProtonMail/libui,ProtonMail/libui,mantyr/libui,tbodt/libui,sclukey/libui,mantyr/libui,mantyr/libui