Sort by Subfolder, then Filename

[cajhin]

(I'm surprised I didn't find this suggestion - did I miss an existing option?)

Use Case:
I have a photo collection sorted by theme, in subfolders.
I want to view them in exactly the order as they are on disk.

Problem:
When I click "Show subfolders", all files are sorted by filename; typically in chronological order.
It's the same issue when you have 5 sessions with files named 0001...0100.

Solution:
Have an option "Sort by subfolder, then filename" somewhere. Or make it the default behaviour? (I never ever want to see subfolders sorted by filename only).

Order should be
/A/1.jpg
/A/2.jpg
/B/1.jpg
/B/2.jpg

(NOT 1 1 2 2)


Bonus points:
I would like to navigate with the cursor keys. <> next previous file, ^v next previous dir