Jeremy Felt b71708647c MS: Provide better UI when a main site's /blog prefix is changed.
The main site on a new network is forced by default into using `/blog` as the prefix for its permalink structure. This can be changed easily through the network admin, though the `options-permalink.php` screen is then unusable to make further changes to the structure.

Now, if `/blog/` is not at the beginning of the `permalink_structure` option, we do not force `/blog` as a prefix in the UI.

Fixes #12002.


git-svn-id: https://develop.svn.wordpress.org/trunk@34749 602fd350-edb4-49c9-b593-d223f7449a82
2015-10-01 20:38:40 +00:00
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