In T405731 we refactored our use of CdxLookup components so that lookups populated by Wikibase API responses use a common component - the apiItemLookup component.

This component takes a lookupSource as a property, and the lookupSource needs to be able to watch changes to the text input of the CdxLookup.

The current implementation uses @input="onInput" to update the lookupSource's lookupInputValue, but also uses v-model:input-value="lookupInputValue" to bind the same. The @input="onInput" should be redundant, and is unnecessary if the lookup is visible when the edit form loads. But without the @input declaration the lookupSource is not able to watch changes to the text input if the CdxLookup is loaded later (e.g. after switching from a novalue to a somevalue snak).

Steps to reproduce

• remove the @input="onInput" from the apiItemLookup
• edit a statement that has a novalue snak for a lookup property (e.g. entity or tabular-data / geo-shape)
• change the novalue to custom
• type in the input box
• observe that the search is not triggered and the drop-down remains empty.

Acceptance Criteria

• The apiItemLookup should work in all situations, without the double watch - either v-model:input-value= or @input= should be used

Note: As there is a working solution and since this is technically an investigation, we've added a timebox :
Timebox: 4 hours