=
is a reserved character in shortcode names, mark it as such.
This allows for shortcodes such as `[shortcode=attribute]` to work, which while never intentionally supported were widely used in the pre-shortcode days. Props aaroncampbell. Fixes #34939 for trunk. git-svn-id: https://develop.svn.wordpress.org/trunk@36097 602fd350-edb4-49c9-b593-d223f7449a82
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