Patryk Zawadzki 9f632dc702 [1.8.x] Fixed #24513 -- Made sure a model is only rendered once during reloads ...

This also prevents state modifications from corrupting previous states.
Previously, when a model defining a relation was unregistered first,
clearing the cache would cause its related models' _meta to be cleared
and would result in the old models losing track of their relations.

Backport of 0385dad073 from master

2015-04-07 14:56:33 +02:00

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