[Feature request] make GUI keep focus of the subtitle line when switching charsets in the preview mode
The GUI has a feature where you can preview a subtitle and try different charsets. It can be a bit annoying because every time you change the charset it scrolls back to the top of the file but often we don't have special characters there. Then you always have to scroll back down to the line where you've seen the problem. It would be nice it kept focus of the line(s) so you could very quickly switch through the different charsets.