feature: The side bar should highlight the currently playing video in the side bar.

[umar-farooque]

Is your feature request related to a problem? Please describe. SideBar doesn'thighlight the currently playing video.Whenever I click on a new video from the sidebar, page reloads and it closes the sidebar.

Describe the solution you'd like It should highlight the sidebar with some icon or title with some diffrent color for the currenlty playing video.And the sidebar should not reload every time we click on the new video it should just update the current playing video on the sidebar.You can check the screen recording below

Additional context Add any other context or screenshots about the feature request here.

[haddercone]

/duplicate #256