Prevent page scroll to top while clicking on language settings icon

If the language settings window is not visible, all calculations
will go wrong and page will scroll to 0 position.

So call scrollIntoView only when the element is visible.

The $.fn.scrollIntoView defined in jquery.uls core may be unnecessary
now since it is available natively on DOM elements.

Bug: T178188
Change-Id: I461fa9eb7c51cd277bebd3a04cfcc0eed9793c4e

resources/js/ext.uls.languagesettings.js

@@ -149,7 +149,9 @@
 				var $this = $( this );
 
 				$this.data( 'module' ).render();
-				languageSettings.$window.scrollIntoView();
+				if ( languageSettings.$window.is( ':visible' ) ) {
+					languageSettings.$window.scrollIntoView();
+				}
 				$settingsMenuItems.find( '.menu-section' ).removeClass( 'active' );
 				$this.addClass( 'active' );
 			} );