URLInput: Use debounce() instead of throttle() (#26529)

Wait until the user finishes typing before sending an AJAX request. This
ensures that there isn't an AJAX request sent every 200 ms while the
user is typing.

packages/block-editor/src/components/link-control/test/index.js

@@ -3,7 +3,7 @@
  */
 import { render, unmountComponentAtNode } from 'react-dom';
 import { act, Simulate } from 'react-dom/test-utils';
-import { first, last, nth, uniqueId } from 'lodash';
+import { default as lodash, first, last, nth, uniqueId } from 'lodash';
 /**
  * WordPress dependencies
  */
@@ -15,6 +15,12 @@ import { UP, DOWN, ENTER } from '@wordpress/keycodes';
 import LinkControl from '../';
 import { fauxEntitySuggestions, fetchFauxEntitySuggestions } from './fixtures';
 
+// Mock debounce() so that it runs instantly.
+lodash.debounce = jest.fn( ( callback ) => {
+	callback.cancel = jest.fn();
+	return callback;
+} );
+
 const mockFetchSearchSuggestions = jest.fn();
 
 jest.mock( '@wordpress/data/src/components/use-select', () => () => ( {

packages/block-editor/src/components/url-input/index.js

@@ -1,7 +1,7 @@
 /**
  * External dependencies
  */
-import { throttle, isFunction } from 'lodash';
+import { debounce, isFunction } from 'lodash';
 import classnames from 'classnames';
 import scrollIntoView from 'dom-scroll-into-view';
 
@@ -39,7 +39,7 @@ class URLInput extends Component {
 		this.bindSuggestionNode = this.bindSuggestionNode.bind( this );
 		this.autocompleteRef = props.autocompleteRef || createRef();
 		this.inputRef = createRef();
-		this.updateSuggestions = throttle(
+		this.updateSuggestions = debounce(
 			this.updateSuggestions.bind( this ),
 			200
 		);