Fix physics UI

Normand Briere

2019-08-06 b3ae4e889872ca0b9ca76f1d17b2f0b961226729

 timeflow/app/actions/TimeflowAction.java
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@@ -27,7 +27,7 @@
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 	}
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-    protected TFModel getModel()
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+    protected TimeflowModel getModel()
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     {
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     	return app.model;
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     }