Fix Firefox post-validation submit handling

[dahlbyk]

• Adds an npm run build before DemoWeb copies dist/
• Enables console logging for DemoWeb
• Fixes Form e.preventDefault() broken in Firefox (0.8.3-0.8.13) #61
  • Form 4 in DemoWeb now includes a preventDefault() that reproduces the issue

From #61 (comment):

Apparently #33 just doesn't work on Firefox. Here's a minimal repro and a proposed fix: https://codepen.io/dahlbyk/full/oNQQoMq.

In short, Firefox isn't firing submit listeners for the redispatch here:

aspnet-client-validation/src/index.ts

Lines 718 to 720 in f09bb57

	submitValidForm = (form: HTMLFormElement, submitEvent: SubmitEvent) => {
	const newEvent = new SubmitEvent('submit', submitEvent);
	if (form.dispatchEvent(newEvent)) {

Using setTimeout(fn, 0) seems to allow the original submit handler to finish before dispatching at the next opportunity.

[haacked]

Thanks!