consider-merging-classes-inherited (R8180)

Several classes in one module extend the same model.

What it does

Reports when two or more classes in the same module extend a model with _inherit = "model" (without their own _name). The message is shown on one of them and lists the others.

Why is this bad?

Extensions of one model spread over several classes are hard to find and review, and their relative order of method overrides depends on the import order of the files.