https://bugs.documentfoundation.org/show_bug.cgi?id=151122

--- Comment #45 from Eyal Rozenberg <[email protected]> ---
(In reply to Manu from comment #44)
I'll start by saying that, if we are tending to accept the list partition
solution, then - we should probably differ the discussion of
partial-coverage-indication to a later time and a separate bug, because we can
start with something simpler (and a "relaxed" heuristic), then refine it later. 

Anyway,

> For example in font Liberation Serif we have this covering per block:
>  ...
> In the fonts parameters, maybe we could add a table where the user can set
> an identification letter per block:

The thing is, block coverage rate is not a good enough indicator of language
glyph coverage, for some written languages. Just as an example: A font could
cover all Hebrew cantillation marks, but fail to cover final letter forms
(םןףךץ) or digits (1234567890). It covers more, but is much less usable. 

> Possible other symbols if you don’t like numbers:
> ◌ not covered   ◔ partially (25 %)   ◑ (partially 50%)
> ◕ (partially 75%)   ● fully covered

That's an interesting suggestion graphically - regardless of how we actually
evaluate coverage. But it would be at least challenging, if not controvertial,
to "stick" something like this onto the list of fonts.

I still think a good starting point would be just the partition Mike suggested
- a rather minimal change UI-wise, with a lot of "bang for the buck".

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