* Upon each visit, the pending mass is added to the mass already seen for that
* commit and then divided into N equal portions, where N is the number of
* parents of the commit being visited. The divided portions are then injected
* Upon each visit, the pending mass is added to the mass already seen for that
* commit and then divided into N equal portions, where N is the number of
* parents of the commit being visited. The divided portions are then injected