Thunar hangs if a copy task that is blocked because another is running for the same device is resumed
Consider the following scenario:
- I start a copy operation for a large file from a slow USB device to a fast SSD; Thunar correctly shows the copy dialog and starts this tasks immediately;
- now I copy another file from a second USB device to the same folder as the previous one. This task is initially stopped and it reports that it's because of another task running for the same device;
- since the target device is much faster than both USB sources combined, I want to overlap the two tasks, so I manually click the resume button for the blocked task.
What should happen is that Thunar starts the second task and runs both in parallel.
What happens is that the Thunar window hangs and the running copy stops. This Thunar window will need to be terminated forcefully.
I reproduced this issue both under Arch Linux and Debian testing.