preview does not render or watch imported .qmd files (or the .html files)

[declann]

Bug description

Importing reactive values from other .qmd files (docs link) is really useful, but those qmd files need to be rendered manually*, so it's not very smooth to develop.

*Current import mechanism is to fetch the html file and process that:
https://github.com/quarto-dev/quarto-ojs-runtime/blob/c2572e5688dfc7d9d584e31033e620b34b11a7d3/src/ojs-connector.js#LL301C1-L301C57

+It may be advantageous to move the import mechanism to processing the qmd contents instead of html, or to output an ojs module for importing purposes.

Quarto 1.2.335 on Ubuntu.

[declann]

Note: watching the html file would be enough to make preview work by setting up multiple previews, but I don't think this is the fix.

A better fix imo is for preview to call the render on imported qmd files and watch those files. This does mean imported html files get updated by a separate qmd preview, but I think this is OK?

[declann]

For info, .ojs imports are watched by preview (no render needed)