se-edu / addressbook-level4 / 3963

94%

Pull #792

travis-ci

EditCommand: Store `Person` to be edited

EditCommand only stores the `Index` of the `Person`
in the current `filteredPersonList` to be edited.

This could cause the wrong `Person` to be edited during the
re-execution of the same command during `redo()` due to
different indexing in different `filteredPersonList` views.

Let's update `EditCommand` to store the `Person` to be
edited before its first execution.

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