Fix multiple selection

Normand Briere

2019-06-27 f78dd18c66d607b693c0bf5937fc59181bf5a26b

 Blob.java
..
..
@@ -82,6 +82,7 @@
82
82
 
83
83
     void retile()
84
84
     {
85
+                new Exception().printStackTrace();
85
86
         System.exit(0);
86
87
 		ClearList();
87
88
         bRep = (new ImplicitTiler(this, ImplicitTiler.SURFACEID, true, true, true, cellSize, cellSize, tolerance, true)).bRep;