Again a minor suggestion regarding user experience / user interface:
Currently the button to toggle on/off the sidebar changes place upon changing sidebar being hidden (first image) and enabled (second image)
As a user I would expect to switch between sidebar on and off, when I click on the same place again, but instead I open the "create folder" dialog when I click again... Thus I would recommend to position the toggle button first also when the sidebar is enabled (see following image).
Thanks for consideration :-)
@th23x

Yes, that's what I meant - you're really quick and very responsive, top job!
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@th23x