Network Enable theme after installation doesn't work

[duck_]

Network enabling a theme after installation, see #18468 and [18569], doesn't work in 3.4. This is because the redirect was switched back to use the referer in [20151].

Network Enabling child themes just doesn't work, and never did as far as I can tell, because of the use of $template instead of $stylesheet. Related: #20914.

Note that the act of network enabling the theme does actually happen (for non-child themes), but you're redirected back to the install page which attempts to reinstall the theme and gives an error message because it's already installed.

For child themes it doesn't work and you're redirected to a nonce failure.

You could network enable child themes just fine, just not from the upgrader. And the upgrader only started supporting child themes in 3.4.

With regards to the impetus to switch back to referer in [20151] — I'm sure I noticed it improved the UX a bit (returning to the same filter page, or same paginated page, etc.), but clearly, the status quo in [18569] and 20916.diff​ at least doesn't break, for the moment.

Replying to nacin:

You could network enable child themes just fine, just not from the upgrader

Indeed. I should have made it clearer that the context for everything I was talking about was from the post-installation screen.

20916.2.diff​ provides the better experience while not breaking the uploader. Tested.

In [21062]:

Use the stylesheet rather than the template to create the network enable theme nonce. Fix network enable redirect following theme installation. Props duck_, nacin. fixes #20916