Cache extra_prefix calculation too
Cache extra_prefix calculation too

xkahn/gvfs-cmis,philipl/gvfs,halfline/gvfs,gicmo/gvfs,halfline/gvfs,halfline/gvfs,thiblahute/gvfs,cpatulea/gvfs,philipl/gvfs,xkahn/gvfs-cmis,gicmo/gvfs,philipl/gvfs,cpatulea/gvfs,thiblahute/gvfs,xkahn/gvfs-cmis,xkahn/gvfs-cmis,gicmo/gvfs,gicmo/gvfs