TinyMCE: do not trigger `execCommand` on loading, it focuses the editor in Chrome.

Fixes #37243.

git-svn-id: https://develop.svn.wordpress.org/trunk@37927 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/js/tinymce/plugins/wplink/plugin.js

@@ -569,7 +569,7 @@
 						toolbar.$el.find( '.wp-link-preview a' ).removeClass( 'wplink-url-error' ).attr( 'title', null );
 					}
 				}
-			} else {
+			} else if ( editToolbar.visible() ) {
 				editor.execCommand( 'wp_link_cancel' );
 			}
 		} );