wxGUI: use FitInside instead of deprecated SetVirtualSizeHints (backport https://trac.osgeo.org/grass/changeset/64635)

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@65041 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/dbmgr/base.py

@@ -2920,8 +2920,12 @@ class LayerBook(wx.Notebook):
                       proportion = 2,
                       flag = wx.TOP | wx.BOTTOM | wx.RIGHT | wx.EXPAND,
                       border = 3)
-        
-        layerSizer.SetVirtualSizeHints(self.addPanel)
+
+        # SetVirtualSizeHints is deprecated and is
+        # exactly the same as FitInside() in wxWidgets 2.9 and later
+        getattr(layerSizer, 'FitInside',
+                layerSizer.SetVirtualSizeHints)(self.addPanel)
+
         self.addPanel.SetAutoLayout(True)
         self.addPanel.SetSizer(pageSizer)
         pageSizer.Fit(self.addPanel)