Use network/update-core.php and redirect to /network/ if it's necessary

[ocean90]

Title is enough.

[nacin]

That looks good.

Thinking we should do an audit for files that should redirect to /network/ when running multisite. Otherwise is_network_admin() would return false and plugins (and potentially core) may get confused.

This file would be one of them. It's a simple is_multisite() && ! is_network_admin() check.

[ocean90]

15525.2.patch is a first pass for nacin's point. PeteMall is also working on it, maybe he has a better idea.

[ocean90]

Refreshed, only /network/update-core.php fix

[nacin]

Original patch still looks good. Just need to exit after the wp_redirect calls.

[ocean90]

15525.3.patch includes the redirection, the link change to network/update-core.php and removes the editor links from the site admin menu if it's multisite.

[nacin]

(In [16747]) Link to network/update-core when running multisite. Remove theme/plugin editors from blog menu when running multisite. Redirect to network/* when accessing theme/plugin-install/editor. props ocean90, see #15525.

[PeteMall]

Tabs should not be shown on the themes page for multisite installs.

[PeteMall]

Hide tabs on site admin themes page for multisite/

[PeteMall]

(In [16754]) Hide tabs on site admin themes screen for multisite. See #15525