[Interest] Drag&drop of a local file does not work under Ubuntu (?)

[Alexander Dyagilev]

Hello,

I'm trying to drag a file FROM my app TO an arbitrary app. Typically - 
Desktop or Explorer/Finder/Files.

Windows, macOS - works fine.

Ubuntu - nothing happens.

I'm using Qt 5.12.12.

Tried Qt 6.4.1 - wow, it started to work. However, I still can't drag to 
Desktop and it seems files are copied instead of move.

1. Is this a known issue?
2. Can anything be done to make it working in Qt 5.12.12?

A bit more details are here:
https://stackoverflow.com/questions/75482138/dragdrop-of-a-local-file-does-not-work-under-ubuntu