Respect changes made in onItemUpdating callback #1233 - #1234
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…urce onItemUpdating's args.item was passed as updatedItem, so if a consumer's handler mutates args.item, that mutation is on updatedItem already; merging from the original editedItem instead silently discarded it. Reconciled by hand with the shallow-extend fix from tabalinas#1102, which touches this same line. Cherry-picked from upstream PR tabalinas#1234.
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… field editing Running the QUnit suite after cherry-picking tabalinas#1102 failed 'complex properties binding: updating deeply nested prop' - shallow $.extend drops sibling nested keys when two dot-path fields (e.g. 'complexProp.subprop1.prop1' and 'complexProp.subprop1.subprop2.prop12') share a nested ancestor, since it only merges top-level keys. That's a real, tested, documented feature (_setItemFieldValue builds genuinely nested objects for dot-path field names), so restoring deep $.extend(true, ...) for both merges in _updateRow. tabalinas#1234's actual fix (merge from the onItemUpdating-mutated updatedItem rather than the raw editedItem) is unaffected and stays.
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Allow modifying an item inside onItemUpdating callback