Select/scroll to new directory after creation

[inexorabletash]

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[inexorabletash]

The window is completely refreshed, and the folder could be inserted anywhere, so one approach would be:

1. Search icons for folder by name
2. Select folder
3. Scroll selection into view

Another would be to add the folder icon manually, rather than refreshing the window. This might be more elegant, but is more code churn and won't reduce the complexity significantly.

cmd_new_folder_impl is the logic - it's pretty simple at the moment. Need to slip the new logic in after the call to select_and_refresh_window

[inexorabletash]

I have the selection logic figured out. Scrolling is proving to be a maze of twisty passages...