Mismatch between shortcode and terminal counts

[andrewheiss]

When using the words-sum shortcode, the number of counted words is slightly off. This is currently mentioned in template.qmd:

An example in this extension is {{{< words-sum ARG >}}}, where ARG is formatted as "ref-note" or "body-append", etc., to count specific sections together. Since words-sum has two words to construct the shortcode but only one word is returned, the region that uses this shortcode is inflated by one.

For instance, with this minimal document:

---
title: "Counts not aligned"
subtitle: "{{< words-sum body >}} words"
format: wordcount-html
---

This sentence has seven words in it.

… the shortcode says that there are 6 words:

…while the terminal output reports 7 words:

Overall totals:
----------------------------
- 7 total words
- 7 words in body and notes

Section totals:
----------------------------
- 7 words in text body

It would be nice to adjust the count after using {{< words-sum ARG >}} so that the shortcode output matches the actual count, maybe by counting all the distinct ARGs and adjusting the count accordingly?