Merge pull request #473 from xxleyi/fix-async-validating

Merge pull request #473 from xxleyi/fix-async-validating · final-form/final-form@d20c44b

Original file line number	Diff line number	Diff line change
`@@ -479,6 +479,12 @@ function createForm<FormValues: FormValuesShape>(`
`479`	`479`	`const afterPromise = () => {`
`480`	`480`	`state.formState.validating--;`
`481`	`481`	`callback();`
	`482`	`+// field async validation may affect formState validating`
	`483`	`+// so force notifyFormListeners if validating is still 0 after callback finished`
	`484`	`+// and lastFormState validating is true`
	`485`	`+if (state.formState.validating === 0 && state.lastFormState.validating) {`
	`486`	`+notifyFormListeners();`
	`487`	`+}`
`482`	`488`	`};`
`483`	`489`
`484`	`490`	`promise`