Drag-and-drop does not work in Plasma+Wayland

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

Drag-and-dropping files from Dolphin into Darktable to import them does not work.

Steps to reproduce

1. select one or more files in Dolphin
2. Drag-and-drop them into the Darktable window

Expected behavior

Darktable should import the images

Logfile | Screenshot | Screencast

I get a 🛇 symbol when I drag the files to the Darktable window

Commit

No response

Where did you obtain darktable from?

darktable.org / GitHub release

darktable version

5.2.1

What OS are you using?

Linux

What is the version of your OS?

Arch

Describe your system

KDE Plasma 6.4.5
KDE Frameworks 6.18.0
QT 6.9.2
Kernel 6.12.48-1-lts
using Wayland

Are you using OpenCL GPU in darktable?

Yes

If yes, what is the GPU card and driver?

Rusticl

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

This used to work, if I recall correctly that was in Darktable 4

Start by reproducing the failure on Linux with KDE Plasma 6.4.5, Qt 6.9.2, and Wayland using Dolphin and darktable 5.2.1, then compare drag-and-drop behavior with the older darktable 4 series if available. Done means dragging one or more files into the darktable window imports the images instead of showing the prohibited-drop symbol.