Notes:
- These may be taking up a bit too much room in some situations. Perhaps an option to turn these on/off is needed?
- I've added a quick hack in area.c -> ED_region_panels_init() to set the flags to make scrollbars show up in regions whose View2D data has already been initialised. This is primarily aimed at the Buttons Window in the 2.5 defaults file, which seems to have been saved in 2.5 or so
- The expand icons on either end of the scrollers don't really seem to be necessary? (or not working yet)
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