Ordering of plugins across layers #36144

Describe the feature

When a child layer overrides a plugin using the same filename, it loses its original execution position and is pushed to the end of the child layer's plugins. This forces either the base layer to know about child layer plugins (breaking layer independence) or accepting wrong execution order. Expected behavior: overriding a plugin in layer should preserve its original slot in the execution order.

Additional information

• Would you be willing to help implement this feature?
• Could this feature be implemented as a module?

Final checks

• Read the contribution guide.
• Check existing discussions and issues.