Text copied from exo-desktop-item-edit can only be pasted if the program is still open

Reported on Launchpad at https://bugs.launchpad.net/ubuntu/+source/exo/+bug/1766097

Confirmed with Xubuntu 22.10 Beta, exo-utils 4.17.2-1

If I copy text from exo-desktop-item-edit and try to paste it in another program, it only works if the exo-desktop-item-edit is still opened. If it's closed, then the content is no longer possible to paste.

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