Undo pkgdown's corruption of Quarto tabsets — fix_quarto

pkgdown's own tweak_tabsets() (written for R Markdown's ## Heading {.tabset} syntax) runs on every <div> whose class merely contains the substring "tabset" - which also matches Quarto's .panel-tabset divs, even though their markup shape is completely different. Quarto's minimal-mode render produces:

Usage

fix_quarto_tabsets(html_path)

Arguments

html_path: Path to an HTML file to rewrite in place.

Value

The number of tabsets repaired, invisibly.

Details

<div class="panel-tabset">
  <ul class="panel-tabset-tabby">...</ul>
  <div class="tab-content">
    <div id="tabset-1-1">...</div>
    <div id="tabset-1-2">...</div>
  </div>
</div>

tweak_tabset() looks for direct <div> children of .panel-tabset to use as "tabs" - it finds exactly one (the .tab-content wrapper), and mistakes it for a single R Markdown tab: the first tab's content is unwrapped into the new nav <button> (as its "title"), and the remaining tabs are left, still correctly id-ed, nested inside one bogus id="NA" pane. The original <ul class="panel-tabset-tabby"> is never touched, so it survives as ground truth for tab order and titles.

This function reverses that: it uses the untouched panel-tabset-tabby list to learn how many tabs there should be, pulls tab 1's content back out of the corrupted nav button, reclaims tabs 2..N from inside the bogus pane (they're already intact), and rebuilds a clean .tab-content div - the shape quartofix()'s CSS/JS expect.