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Changes between Initial Version and Version 1 of Ticket #22252, comment 14

initial	v1
3	3	The problem is that by this point, only one theme root exists, so template_root and stylesheet_root are left untouched. Deleting them here would fix most of these issues.
4	4
5		The remaining issue is that validate_current_theme() should actually validate that any stored theme roots are accurate, to catch potential edge cases. (Such as when the same bp-default theme is in both roots, then one of the roots disappears.) I'd like to try doing that without causing non-existent option calls ~~on single-site~~, though. Basically:
	5	The remaining issue is that validate_current_theme() should actually validate that any stored theme roots are accurate, to catch potential edge cases. (Such as when the same bp-default theme is in both roots, then one of the roots disappears.) I'd like to try doing that without causing non-existent option calls ~~on single-site~~ when there is only one root, though. Basically:
6	6	* If there's one theme root, it should delete any _root options.
7	7	* If there's more than one theme root, it should make sure any _root options are accurate (similar to your code in switch_theme() in 2.patch).