Render Heading to markdown: ValueError: list.remove(x): x not in list about mistletoe HOT 2 CLOSED

@nschloe, I think you are describing 2 mistletoe problems in here:

1. mistletoe isn't made in a way that would support nesting renderers (or maybe just in some cases) - that is the only way I can think of how you can get the ValueError: list.remove(x): x not in list exception from your report. E.g.:

   with MarkdownRenderer() as renderer:
       md = renderer.render(header)
       print(md)
   
       with MarkdownRenderer() as renderer: # fails, because we are globally removing token class for the 2nd time - which is no longer present
           md = renderer.render(header)
           print(md)

2. mistletoe doesn't let you create tokens via their constructors in a nice way, like e.g. the archived mistletoe-ebp fork does. So right now, you need to use e.g. this code instead in order to construct a Heading without parsing:

   header = Heading(
       [2, 'My Title', '']
   )

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Closing this as answered, feel free to "reopen" by commenting. I think to implement the 2 things as described in my latest comment, both would require some major refactoring and both would deserve a separate issue to discuss it thoroughly...

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