Customizer: widget-synced triggers twice

The reason for this is that the widget will run its update logic on keydown and also on change for a given input element. See https://github.com/WordPress/wordpress-develop/blob/4.7.2/src/wp-admin/js/customize-widgets.js#L891-L907

There are some tradeoffs made when widgets were added to the customizer to bring these PHP-driven interfaces into a JS-driven context. It wasn’t perfect and so this is part of the reason behind the JS Widgets feature plugin, to modernize how custom widgets are implemented in the customizer.

If you want to really just listen for when a widget actually changes its state, you can listen for the control’s underlying setting change instead. The setting will only be updated once after a given keydown and subsequent change event.

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