Save as aforesaid, no easement is affected by any change in the extent of the dominant or the servient heritage.

Partition of dominant heritage Partition of dominant heritage.--Where a dominant heritage is divided between two or more persons, the easement becomes annexed to each of the shares, but not so as to increase substantially the burden on the servient heritage :

Provided that such annexation is consistent with the terms of the instrument, decree or revenue proceeding (if any) under which the division was made, and, in the case of prescriptive rights, with the user during the prescriptive period.