undo command for reach selection in geometry

src/View/Geometry/Table.py

@@ -276,3 +276,12 @@ class GeometryReachTableModel(PamhyrTableModel):
             )
         )
         self.layoutChanged.emit()
+
+    def change_reach(self, new_reach, parent):
+
+        self._undo.push(
+            ChangeReachCommand(
+                new_reach,
+                parent
+            )
+        )