Feature request: rebuild on a specific scope id

[shimotori]

On the nested set structure, once indices corrupt, it is difficult to correct them by hand.

But rebuild! is very expensive on large trees, as writtern in the source comment.

So I need the feature of "rebuild on a specific scope id."

This would be the expansion of rebuild! like rebuild!(scope_id: foo).

It rebuilds the tree indices under foo only.

This feature should solve inconsistency in a specific tree at less cost.