Check isolation localsettings

For an extension to be able to work, a change needs to be made in LocalSettings.php to at least call this extension. This does not need to conflict with other extensions. Also additional variables, which did not exist before, may be set. This is acceptable and does not break the isolation.

If this is the only thing that is changed then the extension is : LocalSettings isolated = true

But if an extension needs to modify or disable existing variables, then this may influence other extensions and the extension is : LocalSettings = false.

There is no tool available. But it is quite simple. When installing the extension LocalSettings.php has to be changed. So the installer knows what he/she is doing.