Index: src/js/_enqueues/admin/common.js
===================================================================
--- src/js/_enqueues/admin/common.js	(revision 56420)
+++ src/js/_enqueues/admin/common.js	(working copy)
@@ -1702,22 +1702,19 @@
 				}
 			} );
 
-			// Close sidebar when focus moves outside of toggle and sidebar.
-			$( '#wp-admin-bar-menu-toggle, #adminmenumain' ).on( 'focusout', function() {
-				var focusIsInToggle, focusIsInSidebar;
+			// Close sidebar when target moves outside of toggle and sidebar.
+			$( document ).on( 'click', function(e) {
 
 				if ( ! $wpwrap.hasClass( 'wp-responsive-open' ) || ! document.hasFocus() ) {
 					return;
 				}
-				// A brief delay is required to allow focus to switch to another element.
-				setTimeout( function() {
-					focusIsInToggle  = $.contains( $( '#wp-admin-bar-menu-toggle' )[0], $( ':focus' )[0] );
-					focusIsInSidebar = $.contains( $( '#adminmenumain' )[0], $( ':focus' )[0] );
 
-					if ( ! focusIsInToggle && ! focusIsInSidebar ) {
-						$( '#wp-admin-bar-menu-toggle' ).trigger( 'click.wp-responsive' );
-					}
-				}, 10 );
+				var focusIsInToggle  = $.contains( $( '#wp-admin-bar-menu-toggle' )[0], e.target );
+				var focusIsInSidebar = $.contains( $( '#adminmenumain' )[0], e.target );
+
+				if ( ! focusIsInToggle && ! focusIsInSidebar ) {
+					$( '#wp-admin-bar-menu-toggle' ).trigger( 'click.wp-responsive' );
+				}
 			} );