Automattic/jetpack — pull request #1133 by rase- (2014-09-25 19:12:12+00:00)
Title: Contact Form: Register field shortcode permanently

The activeness of the parsing is toggled via a variable that is set to true whenever the shortcode is needed and false when it is not (and is parsed to empty string).

Requires a new variable to statically store the form we're currently looking at for decoupling field parsing from the form instance.