URL in sidedbar only exists in HTTP POST requests. On HTTP GET requests the
selector ``#search_url button#copy_url`` results in a ``null`` type and a
``.style.display`` raises::
Uncaught TypeError: d.querySelector(...) is null
As a result, the initialization of the event handler is no longer carried out.
Closes: https://github.com/searxng/searxng/issues/3003
Suggested-by: Markus Heiser <markus.heiser@darmarit.de>
This PR improves the UX by making auto-scroll more smoother. The css is changed
so all the auto-scroll will be smoother but User-scroll will not be influenced.
The scroll-behavior CSS property sets the behavior for a scrolling box when
scrolling is triggered by the navigation or CSSOM scrolling APIs.[1]
[1] https://developer.mozilla.org/en-US/docs/Web/CSS/scroll-behavior