I just thought it would be handy to see before opening a folder whether or not it's empty. This could be indicated by a badge displayed at the icon of the folder.
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What about something like this?
left: empty
right: contains items

How does it look in the light theme? It should be easily distinguishable.
what about this?
is the icon used in OneDrive

Looks sweet.
@yaichenbaum
This has been implemented with #1614.
Most helpful comment
What about something like this?
left: empty
right: contains items