Auto focus active move

[ClementCariou]

Hello,

I modified the move list behavior to :

• keep the current scroll position if the active move is in the view
• update the scroll position to match the current move if the active move is outside of the view

It's a quality of life improvement I really needed when using the plugin.

There is a flicker related to the fact we are redrawing the move list from scratch then changing the scroll position.
To keep the code simple, I didn't touch that.