Add option to collapse all subdirectories by default

[geojed]

To navigate large, deeply nested directory structures, it would be helpful if there was an option to by default only display top-level directory in the tree and manually expand subdirectories from there (or even an option to select/collapse multiple directories at once). See example of desired default behavior below.

Current default tree

Desired tree

[Mark Otway]

Can you try pulling webreaper/damselfly:dev (once this build has completed) and see if it does what you need?

It should:

• Persist the expanded state of each folder
• Give you a right-click context menu option to expand or collapse all children of a particular folder.