itemTitle: item title is not updated for newly added items in list

[DomasM]

Version(if relevant): 1.0.0

7.5.0

Environment(if relevant):

vue 2.6.10

Code(if relevant):

see vue demo in you readme

See section itemTitleExample with items having property propertyExample1 set to 'foo', 'bar' and so on.

Expected:

When I add new item and change propertyExample1, itemTitle updates, jsut as it does for old items

Actual:

itemTitle is just the index in the array and does not update

[plantain-00]

v7.20.3 should fix this

[DomasM]

Cool, thanks.