Long time!

This is about STF, I've managed to break it:
- Click near the shadows slider. It goes to 0.05 or so.
- Click-and-drag the midtones slider to 0.00. That's to say, click near it and drag it to the point where it matches the shadows slider.
- Click anywhere near this point:
- If clicking at the left, I would expect to adjust the shadows slider.
- If clicking at the right, I would expect to adjust the midtones slider.
- However, in any case, it's the highlights slider that is adjusted.
From this point on, you can't adjust the shadows or midtones slider, only the highlites one. You can restore the entire GUI using the usual restore button at the lower right corner.
The status of "Link RGB channels" doesn't make any difference.