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Matthias Kuhn e969584ad9 Avoid freezing attribute form with recursion
The search widget wrappers for relations have two issues

* They recursively load whatever relations are defined. With self-referencing this leads to 💀
  This is addressed by only loading one level of relations in search widgets.

* They would load even when hidden, leading to long load times on attribute table opening.
  We now only actually load the form on the show event
2018-03-06 09:46:44 -05:00
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