Picker: trying to autosize the columns
Picker: Force min width for those which load fast
Picker: Wacky workaround for immediate children
Picker: Cleanup wacky workaround
Picker: directory picker
Picker: Use uitools HeaderedListView; WIP
Picker: Restore resizability
Picker: ResizingListView is a little purer
Picker: "Fix" the autoresize. Seems to be OK....
Tweak the new group headers
Picker: Columns only resize larger
Restore picker column widths