[Interest] QWaylandCompositor and Drag & Drop between applications

[GAMILLSCHEG Ralf]

Hello,

I am trying to build a custom Wayland Compositor using the QWaylandCompositor framework.

When I try to drag & drop a simple MIME type between applications, the application receiving the drop crashes with:

wl_display at 1: error 1: invalid method 3 (since 1 < 3), object wl_data_offer at 4278190080
The Wayland connection experienced a fatal error: Invalid argument

I am using Qt 6.7.3 in RHEL 9.4.

To demonstrate, I created a minimal Drag&Drop application in attached QML. You can drag the number from one instance to the other and drop it on the "+" sign. It works fine in X11 as well as in Gnome/Mutter.
When I launch 2 instances in the minimal example QWayland compositor [1], the crash happens when dragging from one instance to the other.

Can anybody give me some hints how to fix this?

Thank You,
Ralf

[1] https://doc.qt.io/qt-6/qtwaylandcompositor-minimal-qml-example.html
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