when doLayout is called on the closed GoogleEarthView panel or on the StreetView panel, because of the layout.rendered = false (which is required to solve another problem between the two plugin: the panel content not being rendered when the panels are re-opened), Ext create a new splitbar when the panel is re-opened, this happen everytime we close and open the GoogleEarthView panel or the StreeView panel.
Merge pull request #621 from camptocamp/fix-googleEarthView

fix splitbar problem with GoogleEarthView / StreetView