Improve flow for privacy.php

[Clorith]

The privacy.php currently in trunk has a button to create a new privacy policy page.

My expectation is that once I create a new page, and am expected to review and edit this page, I should be taken directly to the post editor.

Currently the page refreshes and a notice shows up:

Your Privacy Policy page created successfully. You’ll want to review and edit your policy next.

This text is also a bit confusing, when reading it, I see that my privacy policy page is successfully created. Fantastic, in my head I'm done, I've done what I need to do.

The next part, it says I will want to review and edit it, to me this means I can make changes if I'd like, but it's not a requirement, this would be solved by putting you into the editor straight away and thus removing any uncertainty about the need for editing or not.

[xkon]

This makes total sense. It would actually be inline also with how the users are used to Add New since they're always going straight into the editor.

[ocean90]

It's also confusing that the button doesn't get removed once you have created the page. Each time you click the button a new page is created. Doesn't fill right.

Having two primary buttons that close is also quite unusual on admin screens.

[xkon]

In 43926.diff​ you are redirected to the post editor after you Create a page. Also it hides the Create option if there's already a policy page selected.

[xkon]

redirect after create page

[xkon]

Almost instant patch update. Sorry for that. 43926.2.diff​ takes care of the redirection for the time being.

@ocean90 : I remembered that we had talked about having the 2 options there permanently ( select + create ) even if a page is selected just for the means of a user being able to create 'yet another page' since it's not so clear that you have to clear your selection from the dropdown first for the Create button to re-appear if that makes sense.

[iandunn]

In 43160:

Privacy: Redirect to newly created Privacy Policy page to improve UX.

Previously the user was shown a message that the page was created, but might not understand that they still need to visit the page and publish it. Redirecting them to the page makes it more obvious that additional steps are involved.

Props Clorith, xkon, azaozz.
Fixes #43926.

[iandunn]

Reopening for backport to 4.9.

[azaozz]

In 43161:

Privacy: Redirect to newly created Privacy Policy page to improve UX.

Previously the user was shown a message that the page was created, but might not understand that they still need to visit the page and publish it. Redirecting them to the page makes it more obvious that additional steps are involved.

Props Clorith, xkon, azaozz.
Merges [43160] to the 4.9 branch.
Fixes #43926.

[desrosj]

Moving to the new Privacy component.