DESCRIPTION kwin recently supports only one wl_data_device which breaks Firefox D&D. https://bugzilla.mozilla.org/show_bug.cgi?id=2046911 More than one wl_data_device will allow to implement xdg_toplevel drag in Firefox.
Created attachment 193168 [details] a patch AI generated patch, seems to be working
Will submit the patch via git if it's correct and can be merged.
You might as well submit it; patches in bug reports tend to be missed.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/9417
Git commit e07d87d69916defcdc78ee2cb559ff9363ab2b5f by Vlad Zahorodnii, on behalf of Martin Stransky. Committed on 10/08/2026 at 10:38. Pushed by vladz into branch 'master'. Support more than one wl_data_device KWin uses only first data_device and ignores any other. This patch allows to create and use more wl_data_devices per wl_seat. M +37 -22 src/wayland/seat.cpp M +1 -1 src/wayland/seat_p.h https://invent.kde.org/plasma/kwin/-/commit/e07d87d69916defcdc78ee2cb559ff9363ab2b5f
Git commit 528acd49e4e3b849a5fed2307f4a5e12e1a5a395 by Vlad Zahorodnii. Committed on 10/08/2026 at 11:08. Pushed by vladz into branch 'Plasma/6.7'. Support more than one wl_data_device KWin uses only first data_device and ignores any other. This patch allows to create and use more wl_data_devices per wl_seat. (cherry picked from commit e07d87d69916defcdc78ee2cb559ff9363ab2b5f) Co-authored-by: Martin Stransky <stransky@redhat.com> M +37 -22 src/wayland/seat.cpp M +1 -1 src/wayland/seat_p.h https://invent.kde.org/plasma/kwin/-/commit/528acd49e4e3b849a5fed2307f4a5e12e1a5a395
Thanks!