isSameItem property
A callback function to determine if two items in the list are considered the same.
This function is important to prevent unnecessary animations when editing or updating items.
For example, if your items have a unique id, you can use this function to compare them
and return true, indicating they represent the same item.
Why is this important?
If isSameItem is not defined and you are working with immutable objects (e.g., creating new
instances on every update), the library may interpret these as different items. This will
trigger animations unnecessarily. Additionally, if you are generating Key values directly
from these instances, it can result in the following exception:
Multiple widgets used the same GlobalKey.
To avoid this exception, you must implement the isSameItem callback to accurately compare
the identity of the items in your list.
Example:
isSameItem: (a, b) => a.id == b.id,
Implementation
final bool Function(E a, E b) isSameItem;