Should be visible in the TODO face of this header.
Because the final is not visible, it does not actually gain any additional height. In file:hatty.el::defun hatty–create-hats, we do not cover this case.
This function is only available when hatty-mode is active. Alternatively, I could just check if the mode is active in the timers instead of this function.
For manually inspecting rendering issues not easily testable in an automatic fashion. Show visual before/after, as in the previous TODO.
However, cask does not seem to be packaged for guix.