fix color-of-last-tree-child issue
fix color-of-last-tree-child issue

milikhin/seabass,milikhin/seabass,milikhin/seabass,milikhin/seabass,milikhin/seabass,milikhin/seabass,milikhin/seabass,milikhin/seabass,milikhin/seabass,milikhin/seabass,milikhin/seabass,milikhin/seabass