Filter search results before showing to exclude selected items.

[iamdharmesh]

Description of the Change

As described in #159, currently, we can pick duplicate content using ContentPicker. We already have a logic in place to exclude selected items at ContentPicker component. But this is happening because of the seachQuery cache in the ContentSearch component, the results for search keywords get stored in Object and whenever the same keyword is entered, it shows the stored results without filtering the results by excludeItems.

This PR contains a minor change for applying filterResults() on search results before showing it to prevent showing duplicated items.

Before	After

Closes #159

How to test the Change

1. Checkout
2. Run npm i && npm run build
3. cd to example folder, run npm i && npm run build && npm run wp-env start
4. Visit http://localhost:8888/wp-admin (user: admin, password: password)
5. create new page/post. Add "Hello World" block.
6. search and select content and verify it doesn't show duplicate items.

Changelog Entry

Fixed - ContentPicker can pick duplicate items before save.

Credits

Props @Firestorm980 @iamdharmesh

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

[fabiankaegy]

Thanks for this addition 🚀