Fix Copy block button focus loss and try to remove the visually hidde…

…n textarea (#24022)

packages/compose/src/hooks/use-copy-on-click/index.js

@@ -32,12 +32,17 @@ export default function useCopyOnClick( ref, text, timeout = 4000 ) {
 			container: ref.current,
 		} );
 
-		clipboard.current.on( 'success', ( { clearSelection } ) => {
+		clipboard.current.on( 'success', ( { clearSelection, trigger } ) => {
 			// Clearing selection will move focus back to the triggering button,
 			// ensuring that it is not reset to the body, and further that it is
 			// kept within the rendered node.
 			clearSelection();
 
+			// Handle ClipboardJS focus bug, see https://github.com/zenorocha/clipboard.js/issues/680
+			if ( trigger ) {
+				trigger.focus();
+			}
+
 			if ( timeout ) {
 				setHasCopied( true );
 				clearTimeout( timeoutId );