customize_validate_{$setting_id}
filter value to ensure it is a WP_Error
.
While the filter is documented to only support a `WP_Error`, it has been a common practice to return true in a validation function if no errors have occurred. This was already caught when the same filter was executed in `WP_Customize_Setting`, it was however missing in `WP_Customize_Manager::validate_setting_values()`. Fixes #44809. git-svn-id: https://develop.svn.wordpress.org/trunk@43578 602fd350-edb4-49c9-b593-d223f7449a82
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