youtube-player

⚬ PROBLEM:

Some content creators make videos where the aspect ratio changes during the video. When their video itself has a different aspect ratio than the monitor of the viewer, the "transparent background" option creates two differently colored bars, which is distracting in my opinion.

Example:
![Example](https://user-images.githubusercontent.com/41735601/114696189-b0747780-9d1c-11eb-9f

The Shortcuts plugin doesn't support all shortcuts available in Youtube music web interface.
I have found a nice summary of all shortcuts: https://support.google.com/youtubemusic/thread/180145?hl=en
(an alternative way is to press Shift+/ on the Youtube music web site to get the list of shortcuts).

Describe the bug
The pin feature, which keeps the toolbar always on the window, is not working. Even when it's pinned, it's going away.

Steps to reproduce
Steps to reproduce the behavior:

1. Open a window and set toolbar to Pin
2. take curser off window
3. toolbar disappears.

Expected behavior
The toolbar should stay pinned

Screenshots
![image](https://user-images.