Fix flush UI.

Normand Briere

2019-05-02 a76491b66a2e304d9ae27a162f407b98c70fbafa

 timeflow/app/actions/DeleteFieldAction.java
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@@ -33,7 +33,7 @@
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 		if (fieldToDelete!=null)
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 		{
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-			TFModel model=getModel();
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+			TimeflowModel model=getModel();
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 			Field f=model.getDB().getField(fieldToDelete);
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 			model.getDB().deleteField(f);			
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 			model.noteSchemaChange(this);