Fixes#14032.
When duplicating arrays that contains nested arrays, the newly
duplicated row will include twice as many fields within the nested array
as the original.
This is because duplicated row ids don't match 1:1 with their parent's
`rows` property.
For example: `array.0.nestedArray.0.id` should match
`array.0.nestedArray.rows[0].id`.
The problem is that when we duplicate the row, we regenerate all nested
id fields, but we fail to sync them its corresponding row in its parent
field. When we go to build form state on the server, we build new fields
for this stale row. Then when we merge server form state back into local
state, those new fields are simply _merged_ with the local state without
replacing them.
This is how we determine whether local changes to a row took place while
a form state request was pending. It is important to prevent the merge
strategy from overriding your active changes.
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