Revert "Since __lt__ methods are safe, is not needed to stop and reenable sorting."

This reverts commit ac92bb5fdf.

qubesmanager/qube_manager.py

@@ -404,6 +404,8 @@ class VmManagerWindow(ui_qubemanager.Ui_VmManagerWindow, QtGui.QMainWindow):
         self.qubes_app.domains.clear_cache()
         qid = int(domain.split('/')[-1])
 
+        self.table.setSortingEnabled(False)
+
         row_no = self.table.rowCount()
         self.table.setRowCount(row_no + 1)
 
@@ -412,6 +414,7 @@ class VmManagerWindow(ui_qubemanager.Ui_VmManagerWindow, QtGui.QMainWindow):
             if vm.qid == qid:
                 vm_row = VmRowInTable(vm, row_no, self.table)
                 self.vms_in_table[vm.qid] = vm_row
+                self.table.setSortingEnabled(True)
                 return
 
         # Never should reach here