Created attachment 9006
video of bug
It minimizes if you minimize thunar, but you should be able to minimize just that window.
Created attachment 9009
Agreed that it would be nice to have the posibility to minimize.
Patches are welcome !
Possibly not a thunar, but a xfwm problem
With xfwm 4.12, non-transient dialogs didn't have the minimize button, now they have but it doesn't work, so I'm almost sure it's a bug (reproducer: https://gist.github.com/andreldm/f96da5f58276bc9fe076d4d072a9ee97)
moving it to xfwm4
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