Fix physics UI

Normand Briere

2019-08-06 b3ae4e889872ca0b9ca76f1d17b2f0b961226729

 timeflow/vis/timeline/TimelineRenderer.java
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@@ -36,7 +36,7 @@
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                 g.setTransform(AffineTransform.getTranslateInstance(0, -dy));
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                 g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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-                TFModel model = visuals.getModel();
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+                TimeflowModel model = visuals.getModel();
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                 Display display = model.getDisplay();
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                 ActDB db = model.getDB();
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