Passing CSS vars to inline components isn't supported in MDsveX files

[AndrewLester]

Passing CSS vars to inline components isn't supported in MDsveX files. Example: Compiling this:

<script>
  import Chart from './Chart.svelte';
</script>

# Hello friends

Inline: <Chart --foo="bar" />

Yields this:

<script>
  import Chart from './Chart.svelte';
</script>

<h1>Hello friends</h1>
<p>Inline: <Chart —foo=“bar” /></p>

The issues are that the "--" is turned into an em-dash and the quotes around the CSS var value are smartified.

When the component isn't inline, it works properly.

[pngwn]

smartypants is doing this