Add poll based file change detection as fallback

[aormsby]

What version of Hugo are you using (hugo version)?

v0.63.2

Does this issue reproduce with the latest release?

Yes, this is the latest.

The issue - virtual dev environment doesn't seem to take /static/style.css into account on reloads

hugo server -D
I use the virtual environment a lot (it's great!), but I've noticed that the styles I add to my static.css file are missing when the site reloads on saving a file. The process must be skipping over them somehow. I can force them to be included by saving static.css - the system must include it since it's a marked file at that point. Otherwise, my styles disappear.

This isn't a huge deal, but it's kind of a pain to have to save my changes and then re-save static.css again. If someone could look into this, I'd really appreciate it.

[bep]

fsnotify/fsnotify#9

[github-actions]

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