Consider changing event-queue for inactive tabs to be full-reload aware

[kezabelle]

Currently, if I emit a CSS change, and then a HTML change (e.g. cos I'm using Tailwind via: tailwindcss-macos-x64 -w -o path/to/static/tailwind.css) both get picked up fine, at least as long as I'm using udomdiff or whatever for HTML.

But if one of the events needs to do a full reload (which is partially known because the event can emit it, from what it considers full-reload worthy [i.e. root templates]), maybe I should just cancel all the other pending ones and do that one on tab re-activation.

... Maybe it's workable, maybe not. Noting it down for myself.