docs(canvas): add support note for Braille marker

[joshka]

Addresses #457

[joshka]

Pinging @relf for input

[codecov]

Codecov Report

Merging #472 (73d57ae) into main (0c68ebe) will not change coverage.
The diff coverage is n/a.

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  Coverage   90.06%   90.06%           
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  Files          40       40           
  Lines       11166    11166           
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  Hits        10057    10057           
  Misses       1109     1109           

Files Changed	Coverage Δ
src/symbols.rs	72.41% <ø> (ø)
src/widgets/canvas/mod.rs	91.90% <ø> (ø)

[Valentin271]

I wonder should we link to some fonts that support this? Otherwise LGTM.

[orhun]

+1

[relf]

The thing is, discovering ratatui, I just ran the demo and seing I did not get the right result out of the box, I started to dive into the code to find out, your additions would have definitely helped.
That said, I've just noticed now (!) that I've skipped the warning just after in the example section where you explain about having gliphs not showing up correctly 🤦‍♂️, maybe some bold font could have helped (?) and/or links to "good" fonts would be nice right here.
The default configuration on Windows (Consolas font) does not work, I think this could be stressed as an example of "bad" configuration.
Anyway thanks and keep up the good work!

[kdheepak]

Should we also add a one line text description to the ui in the example for chart.rs?:

https://github.com/ratatui-org/ratatui/blob/0c68ebed4f63a595811006e0af221b11a83780cf/examples/chart.rs#L145

Something like "Requires terminal and font support for unicode".

[joshka]

The default configuration on Windows (Consolas font) does not work, I think this could be stressed as an example of "bad" configuration.

I'd be more inclined to suggest that whatever we do with demos should generally look good out of the box for a default configuration, so perhaps we should switch to dots instead of braille for the main demo and introduce the braille markers later?

[Valentin271]

Yes this seems like a good idea to me.

[relf]

demos should generally look good out of the box for a default configuration, so perhaps we should switch to dots instead of braille for the main demo and introduce the braille markers later

Yes that was my first thought but I did not dare to suggest it (more involved changes), but now that you say it...

[joshka]

I wonder should we link to some fonts that support this? Otherwise LGTM.

Perhaps a wiki page might be appropriate for this?