If no metadata is available, then the tooltip will revert to the current behavior (display second comment block in the file or no documentation available).
If you are on master, you can test this starting later today.
@wpferguson , using a small font the on/off icons ( ~/.config/darktable-dev/lua/data/icons/path20.png ) are too big (see screenshot).
Running dt with GTK_DEBUG=interactive I tried to determine the name of the GTK object to scale the icons down a bit using user.css. Unfortunately, I could not find a name for these objects. Could you please give me a hint on how to scale down the icons using CSS.
Downscaling the image files ~/.config/darktable-dev/lua/data/icons/path20.png and ~/.config/darktable-dev/lua/data/icons/blank20.png with GIMP works in principle, but I’m afraid it’s not a sustainable approach.