REPLines: Fix undo commands.

src/Model/Tools/PamhyrListExt.py

@@ -83,7 +83,7 @@ class PamhyrModelList(SQLSubModel):
         return self.lst.index(el)
 
     def get(self, index):
-        if len(self._lst) == 0:
+        if len(self.lst) <= index :
             return None
 
         return self.lst[index]
@@ -122,7 +122,10 @@ class PamhyrModelList(SQLSubModel):
         raise NotImplementedMethodeError(self, self.new)
 
     def insert(self, index, new):
-        self._lst.insert(index, new)
+        if new in self._lst:
+            new.set_as_not_deleted()
+        else:
+            self._lst.insert(index, new)
 
         if self._status is not None:
             self._status.modified()
@@ -165,7 +168,7 @@ class PamhyrModelList(SQLSubModel):
                 lambda x: x[1],
                 filter(
                     lambda x: x[0] in indexes,
-                    enumerate(self.lst)
+                    enumerate(self._lst)
                 )
             )
         )