smart quotes cause strange behavior in markdown stacks

problematic characters:

• multi-byte characters like:
  • smart quotes “smart”
  • smart dashes like —
• grapheme clusters like:
  • 🍻
• ZWJ composed characters like:
  • 🧑🏾‍🚒

are used in MarkDown stacks the results get weird. primarily it will, for each of these characters, count them as 1 character. if the cluster is 5 characters then 4 characters will be trimmed from the end of the markdown text.

over the course of a long text stack ever use of a smart quote will trim off one character — so a lot can get trimmed