Mark Jaquith 0188ec7f1c Tell developers how to correctly silence register_sidebar() notices.
* If we just tell them they they should set an `id` parameter, they might set an arbitrary one on an existing (i.e. not in-development) theme, causing widgets to be lost.
* This way, we tell them to set it to the auto-generated `id` that the sidebar already has.
* Widget content is not lost, and now their sidebar has a concrete handle.

fixes #31675

git-svn-id: https://develop.svn.wordpress.org/trunk@32110 602fd350-edb4-49c9-b593-d223f7449a82
2015-04-11 21:33:14 +00:00
2015-03-13 18:11:33 +00:00
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