Customize: widgets search shouldn't show widgets on click on clear button

[Mahesh901122]

On click on the close button after the widget search, it does not show all widgets.

See video before applying patch ​https://www.youtube.com/watch?v=7uwe5LF6kI8

After applying patch - ​https://www.youtube.com/watch?v=wYg15c_CrvQ

[Mahesh901122]

I have found the same issue for the customizer menu item search box too. But the same patch not works for the menu items.

File: \src\js\_enqueues\wp\customize\nav-menus.js line 219:

self.$search.val( '' ).focus().trigger( 'keyup' );
self.collection.doSearch( '' ); // NEW CODE HERE TO RESET THE SEARCH.

But it not works for menu search. So, I have just created a patch for the customizer widget search.

[pento]

In 45658:

Customizer: Show all widgets when the search field is cleared.

When clicking the clear button on the widget search field, the search results should refresh to show all widgets.

Props Mahesh901122.
Fixes #47534.