Clearing input term does not call the action if the same search term is re-entered.

[bahdvp]

Steps to recreate on ember-aupac-typeahead 3.1.x and the following code:

      {{aupac-typeahead
        action=(action (mut searchInput))
        placeholder=placeholder
        allowFreeInput=true
        source=(action "searchAsync")
        async=true
        selection=(readonly searchInput)
      }}

1. Input "text" into search field
2. Using another action, clear searchInput (i.e. this.set('searchInput', '');)
3. Input "text" into search field again
4. No update occurs.

This issue does not occur if you use a different search term (i.e. "text" followed by "text_")

[bahdvp]

I've just extended the class for now but it looks like this is because of line 253-260 in aupac-typeahead.js: updateSelectionWhenChanged.

When you clear searchInput, oldValue is updated to the first term (in the case above, text). On subsequent updates, oldValue is then equal to value and the action is never sent.