open fun addAll(index: Int, elements: Collection<E>): Boolean
Overrides MutableList.addAll
Platform and version requirements: JS
Inserts all of the elements in the specified collection elements into this list at the specified index.
Return true if the list was changed as the result of the operation.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-abstract-mutable-list/add-all.html