Optimise storing children links by MerkleClock

[islamaliev]

When storing children links in the merkle/clock/clock.go:ProcessNode method mc.headset.Write(ctx, root, rootPrio) is called in the loop for every child although it stores the same value (not child related)

[jsimnz]

This will likely be related to #1066. Since we merge in the reverse direction, the headset Write is basically doing useless work as you note here.

Once 1066 is fixed, this will change, as it will make the "merge direction" for the CRDT forwards instead of backwards. Which will mean that each headset update will actually be a new update

[fredcarle]

closed by #2016