Bug 442232

Summary: On Wayland, Dolphin always sends WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY even when holding Shift
Product: [Applications] dolphin Reporter: Nicolas F. <kdebugs>
Component: generalAssignee: Dolphin Bug Assignee <dolphin-bugs-null>
Status: RESOLVED UPSTREAM    
Severity: normal CC: kde, kfm-devel, meven29, nate
Priority: NOR Keywords: wayland
Version: 21.08.1   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In:

Description Nicolas F. 2021-09-09 15:30:20 UTC 
When dragging and dropping, holding shift and dropping a file should send WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE to the application. However, Dolphin always sends WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY. This breaks Shift+drop to append files to playlist on mpv.


STEPS TO REPRODUCE
1. mpv --no-config --idle --pause videohere.mp4
2. Shift+drag and drop a file from Dolphin onto mpv

OBSERVED RESULT

mpv receives a WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY event from Dolphin, which means it replaces the currently playing file.


EXPECTED RESULT

mpv receives a WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE event from Dolphin, which means it'll append the file to the playlist


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.13.13
(available in About System)
KDE Plasma Version: Plasma 5.22.5
KDE Frameworks Version: Frameworks 5.85
Qt Version: 5.15.2

Only occurs on Wayland, it's a Wayland specific problem.

Bug report on mpv's side: https://github.com/mpv-player/mpv/issues/9201
Comment 1 Méven Car 2021-10-25 13:26:35 UTC 
Seems a bit related to https://bugs.kde.org/show_bug.cgi?id=423031

And upstream patch.
https://codereview.qt-project.org/c/qt/qtwayland/+/334777
Comment 2 Nicolas F. 2023-05-15 10:40:27 UTC 
It's actually even more broken now despite the Qt thing being merged. Holding shift before the drag-and-drop operation no longer works either. I give up. Feel free to reopen, or don't, whatever makes you feel better, I no longer care.

Operating System: Arch Linux 
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9
Kernel Version: 6.3.1-arch2-1 (64-bit)
Graphics Platform: Wayland
Processors: 8 × AMD Ryzen 7 PRO 3700U w/ Radeon Vega Mobile Gfx
Memory: 13.5 GiB of RAM
Graphics Processor: AMD Radeon Vega 10 Graphics
Manufacturer: LENOVO
Product Name: 20NK000GMZ
System Version: ThinkPad T495