Automatic redirects with _wp_old_slug won't mantain GET parameters if present

[DrLightman]

If for example links come up with GET parameters, for example utm parameters for analytics, they get stripped before the redirect.

post_name = 'new-slug'
_wp_old_slug = 'old-slug'

​http://example.org/old-slug/?utm_source=test1&utm_medium=test2&utm_campaign=test3

Wordpress will build the link for the redirect to the new slug without any GET parameter:

​http://example.org/new-slug/

I think it should mantein them instead:

​http://example.org/new-slug/?utm_source=test1&utm_medium=test2&utm_campaign=test3

I'm not even sure if this should be classified as a bug, if it's the correct behaviour or not. I'll let you judge.

[desrosj]

Preserve $_GET params on _wp_old_slug redirects

[brookedot]

I'll give refreshing @desrosj's patch a go. As old_slug_redirect_url is filterable there is a workaround to add the query parameters with that filter but I think having it fixed in core would be great.