Tabbing to next snippet field not working

[PEZ]

When entering code with the help of a snippet, you are supposed to be able yto tab your way through the various fields provided by the snippet. Like if I have this in my clojure.json for instance:

	"defn": {
		"prefix": "(defn",
		"body": [
			"(defn ${1:name}",
			"  \"Don't foget the docs!\"",
			"  [${2:args}]",
			"  $3"
		],
		"description": "(defn ...) function body",
	}

I should be able to tab to name, args, and then to the start of the function body.

However, in Calva the default key binding for tab is to format the current enclosing form. I think this is quite easily fixed by guarding for snippet mode in the when clause of that key binding.