Fix: tell the user if a font fails to load and fallback is about to be used #8559
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Fixes #7615 (well, not really fixes, but informs the user better).
Motivation / Problem
When fonts fail to load, the user is not informed why and that it failed. Instead, system fallback is loaded, and that is all she wrote. Really frustrating for the user, as he would think he did the path wrong or something. None of that .. if only a single glyph is missing, all the fonts are rejected and the system fallback is used.
Description
So instead of doing stuff in silence, be a bit more talkative:
Hopefully that makes it a bit easier to debug font issues :)
Limitations
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.