Sliders in darkroom modules don't respond to keyboard input, but change image rating
When I go to darkroom mode and select a module with a slider and right click on it, I was previously able to change the value of the sliders using the keyboard. The sliders do not respond to keyboard input at all. It looks like the film strip always has keyboard focus, because when I type the numbers 0-5 to change the sliders value, the star rating of the current image changes. Typing other digits has no effect. Disabling the film strip in the settings doesn't help. Typing 0-5 in sliders still affects the rating.
This was already broken in previous versions: at least 2.0.7, but maybe also 2.0.6. Sorry for reporting late. But it's just now that I have time to analyze all the bugs I ran into over the past month.
I also tested this on a fresh Ubuntu 16.10 + darktable 2.2.0 ppa (virtual machine). Unfortunately, the issue doesn't appear there. When I right click on a slider, I can change its value via keyboard just fine. It seems to be a macOS-only issue.