ikiwiki/doc/bugs/graphviz_wide_characters.mdwn

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If you include a wide character, such as a fancy quote, in a [[graphviz|plugins/graphviz]] source file for use with the file parameter to the graph directive, you get the following error:
```
[[!graph Error: Wide character in subroutine entry at /usr/share/perl5/IkiWiki/Plugin/graphviz.pm line 57.]]
```
Note, this is what renders on the resulting wiki page, not something that you see on the command line.
Since dot supports UTF-8, I would expect this to work.
I'm unsure if this is a bug in the graphviz plugin, or in the perl module it depends upon, but figured I would start here.
> This reminds me of [[bugs/table can not deal with Chinese ]] *—[[Jon]], 2020-11-02*