Sync from devel:
    Thu Jun 03 2010 Kevin Kofler <Kevin@tigcc.ticalc.org> 2.2.0-0.3.beta1
    - fix regression making single-click mode unusable
    - fix regression: "rename selects extension" not working (SF#3003338)
    - force reloading when opening a file in the viewer (SF#2969403)
    - fix bogus toplevel entries being shown in the viewer menu (SF#2981303)
    - fix the text viewer not being read-only (SF#2898151)