Fatal error after installing the module (incompatibility with Context & Menu position module)

@Berdir trying to move this forward, can you please provide some additional technical direction? What should the requirements check be, and what would you then expect the error to say?

I think @Berdir is correctly pointing out that there is unlikely a good/proper way to have this module enabled along with either the context or menu_position modules. All 3 modules are attempting to take over the menu.active_trail.

The decorator approach does allow both context and this module to be enabled successfully, and this module's functionality does seem to work correctly in my limited tests. However, it appears that the context's ContextMenuActiveTrail class will no longer get called unless "Drupal Core Behavior" is chosen. This is probably to be expected.

However, I think I might accept this for our use cases. If this module works well enough for us, we might not need to use the context module's "Menu" reaction. Maybe a warning on the status page (requirements) that this module is disabling the active trail functionality within the context module?

Configuring a menu's Menu Trail Source to use Drupal Core Behavior will also again allow the context module to set the active menu trail (since it takes over core).