Plugin Editor does not work for Must-Use Plugins

[hakre]

Since [10737] (WP 2.8), WordPress has support for so called ​Must-Use Plugins. Since [13233] (WP 3.0) those are listed in the admin panel.

By default, Plugins can be edited on the Edit Plugins page (/wp-admin/plugin-editor.php).

On WordPress 3.0.4 it's not possible to edit Must-Use plugins.

User who can edit plugins should be enabled to edit the must-use-variant of plugins as well.

Related: #11861

Should we be allowing users to edit must use plugins? I think this is intentional.

If WordPress core is going to "allow" users to edit Plugins on-the-fly, why should core differentiate between must-use Plugins and Plugins that can be deactivated? This differentiation makes no sense, unless the editor could only be used to edit deactivated Plugins.

If WordPress core provides a user capability specific to editing Plugins, then that capability should apply to all Plugins.

Replying to chipbennett:

If WordPress core is going to "allow" users to edit Plugins on-the-fly, why should core differentiate between must-use Plugins and Plugins that can be deactivated? This differentiation makes no sense, unless the editor could only be used to edit deactivated Plugins.

If WordPress core provides a user capability specific to editing Plugins, then that capability should apply to all Plugins.

I think the way it works right now is the smarter route.

Normal plugins will automatically be deactivated if a fatal error is detected, whereas "must-use" plugins can't be deactivated, error or not. I definitely wouldn't want to be in a situation where it would be possible to introduce a fatal error into a plugin via the interface that can't be deactivated from that same interface.