Emacs mode to display in the modeline the low-level font being used at point, along with its effective pixel dimensions or other properties.
Also provided is show-font-mode-overlay, which will paint each
on-screen font in a different tint. This should help debug unwanted
fallback fonts.
I made this to debug complex issues with fontsets not doing quite what I wanted, custom faces being very annoying to save programatically &c.
〜Melissa