id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
20692	Handle unsaved changes in the customizer	koopersmith	helenyhou	"Losing your changes is no fun.

The way I see it, we have two options:

1) Show an AYS when leaving the customizer by using an onbeforeunload handler.
2) Store unsaved customizations in a customize_data_$stylesheet option. The fact that certain customize settings persist across theme changes (options) while others don't (theme_mods and some theme-specific options) could pose a problem.

I say let's start with #1."	enhancement	closed	normal	3.4	Appearance	3.4	normal	fixed	has-patch