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Changes between Initial Version and Version 1 of Ticket #45040, comment 7

initial	v1
9	9	> The overall width of the content area in the back-end does not match the front-end, when you aren't using the Main Sidebar.
10	10
11		Yes! At the moment, there isn't a~~n easy way to tell if there's a sidebar on the site~~. I think the best case is that the editor would pull in the theme's body classes, to avoid adding complicated code to the theme.
	11	Yes! At the moment, there isn't a built-in way to tell if there's a sidebar on the site from the editor. I think the best case is that the editor would pull in the theme's body classes, to avoid adding complicated code to the theme.
12	12
13	13	I've added that here for now, and will keep an eye on it: https://github.com/WordPress/gutenberg/issues/10640#issuecomment-431427463