Wrong timing for scrolling to the top when handling click

[platosha]

Noticeable in https://directory.demo.vaadin.com/

Expected behaviour:

• Click a router link
• Shows the new page and sets the scroll to the top at the same time

Actual behaviour:

• Click a router link
• Scrolls the current page to the top
• Shows the new page

In addition, scrolling early messes up the browser’s own logic for restoring scroll position when navigating using back/forward buttons. To not interfere, scrolling should happen after the history is updated with a new entry.