Fix regression with refresh

Normand Briere

2019-06-25 ecff440ceef3ad352aa64cedbb913107ec4863a5

 GroupLeaf.java
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@@ -9,7 +9,8 @@
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  */
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 public class GroupLeaf extends Composite
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 {
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-    static final long serialVersionUID = -1647706059469889079L;
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+    static final long serialVersionUID =  // for wader: -6036608125951558970L;
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+                                -1647706059469889079L;
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     GroupLeaf()
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     {