Hotkey to completely hide subtitles

[cessen]

First: thank you so much for creating this video player. It is absolutely amazing. I am now using it for nearly all of my video-based language studying. Also, as a Linux user: thanks for maintaining a Linux release!

Now for the feature request:

Right now when subtitles are disabled, the player still displays blurred out subs with a dark subtitle bar behind it. This is great for many of the study modes, but sometimes I just want to watch the show without subtitles, focusing on listening, and only enable the subtitles occasionally when I hear something "i+1". In this use-case, the subtitle bar and blurred out subtitles are distracting, and they keep pulling my eye down to look at them whenever they change.

It would be great to have a hotkey to completely hide the subtitles, including the dark bar.