wxGUI/dbmgr: attempt to fix https://trac.osgeo.org/grass/ticket/828 (wxPython GUI: gtk error message when viewing vectors and attributes)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@50000 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/dbmgr/manager.py

@@ -2573,6 +2573,7 @@ class LayerBook(wx.Notebook):
                       flag = wx.TOP | wx.BOTTOM | wx.RIGHT | wx.EXPAND,
                       border = 3)
         
+        layerSizer.SetVirtualSizeHints(self.addPanel)
         self.addPanel.SetAutoLayout(True)
         self.addPanel.SetSizer(pageSizer)
         pageSizer.Fit(self.addPanel)