Weston Ruter 3c7a504ed4 Customize: Prevent outputting value attribute if already supplied among input_attrs.
This allows for `input[type=button]` controls to be added without producing illegal HTML.

Amends [41740].
See #30738, #33085.


git-svn-id: https://develop.svn.wordpress.org/trunk@41822 602fd350-edb4-49c9-b593-d223f7449a82
2017-10-11 04:25:57 +00:00
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