i.group dialog: select all - data changed message

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@58180 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/gui_core/dialogs.py

@@ -763,7 +763,8 @@ class GroupDialog(wx.Dialog):
         check = event.Checked()
         for item in range(self.subgListBox.GetCount()):
             self.CheckSubgItem(item, check)
-            
+            self.dataChanged = True
+
         event.Skip()
 
     def OnGSelAll(self, event):