Review Request: Add a new prefab instance only once to a prefab

[Felix Rohrbach]

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http://git.reviewboard.kde.org/r/102689/
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Review request for Gluon.


Summary
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As PrefabInstance::setPrefabLink already adds the new instance to the instance list, we don't need to do it again in the Prefab::createInstance function.

This bug was causing a crash when creating a new prefab from a game object. To reproduce,
1. drag a gameobject with at least one child into the prefabs folder
2. try to expand the gameobject in the scene model


Diffs
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  engine/prefab.cpp ab60e7e 

Diff: http://git.reviewboard.kde.org/r/102689/diff


Testing
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Thanks,

Felix

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