cosmic-files freezes after drag-and-drop due to duplicate leave events

[TheEnchantedPotato]

Hyprland sends duplicate wl_data_device.leave() events after drop()

Already reported?

• I have searched the existing open and closed issues.

Regression?

• Unknown

System Info and Version

Hyprland 0.52.1 built from branch v0.52.1 at commit 967c3c7404d4fa00234e29c70df3e263386d2597 clean (version: bump to 0.52.1).
Date: Sun Nov 9 23:31:36 2025
Tag: v0.52.1, commits: 6564
Libraries:
Hyprgraphics: built against 0.4.0, system has 0.4.0
Hyprutils: built against 0.10.3, system has 0.10.4
Hyprcursor: built against 0.1.13, system has 0.1.13
Hyprlang: built against 0.6.6, system has 0.6.6
Aquamarine: built against 0.10.0, system has 0.10.0
no flags were set
System Information:
System name: Linux
Node name: Nordix
Release: 6.17.9-2-cachyos
Version: #1 SMP PREEMPT_DYNAMIC Mon, 24 Nov 2025 17:57:32 +0000
GPU information:
03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Navi 31 [Radeon RX 7900 XT/7900 XTX/7900 GRE/7900M] [1002:744c] (rev c8)
15:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Raphael [1002:164e] (rev c1)
os-release: NAME="Arch Linux"
PRETTY_NAME="Arch Linux"
ID=arch
BUILD_ID=rolling

Bug Description

Hyprland sends duplicate wl_data_device.leave() events after a drag-and-drop drop() operation. This has been confirmed with two different applications using different toolkits:

Application	Toolkit	Duplicate leave received	Result
cosmic-files	libcosmic/iced (Rust)	✅ Yes	Freezes
cosmic-app-library	libcosmic/iced (Rust)	✅ Yes	Freezes
Nautilus	GTK4	✅ Yes	Works (handles gracefully)

The same cosmic-files version works perfectly on Wayfire compositor, confirming this is Hyprland-specific.

Expected Wayland protocol sequence

According to the Wayland protocol, after a successful drop the sequence should be:

wl_data_device.drop()
wl_data_device.leave()

Actual Hyprland sequence

wl_data_device.drop()
wl_data_device.leave()
wl_data_device.leave()    # <-- DUPLICATE (protocol violation)

Debug Evidence

Test 1: cosmic-files (libcosmic/iced)

WAYLAND_DEBUG=1 cosmic-files 2>&1 | grep -i "drop\|leave"

[2279012.631] wl_data_device#87.drop()
[2279012.636] wl_data_device#87.leave()
[2279452.696] wl_data_device#87.leave()    # <-- DUPLICATE (~440ms later)

Result: Application freezes, must be killed.

Test 2: Nautilus (GTK4)

WAYLAND_DEBUG=1 nautilus 2>&1 | grep -i "drop\|leave"

First drag-and-drop:

[3433611.264] wl_data_device#31.drop()
[3433611.269] wl_data_device#31.leave()
[3433611.517] wl_data_device#31.leave()    # <-- DUPLICATE (~250ms later)
[3433611.519] wl_data_source#118.cancelled()

Second drag-and-drop:

[3456571.328] wl_data_device#31.drop()
[3456571.331] wl_data_device#31.leave()
[3456571.580] wl_data_device#31.leave()    # <-- DUPLICATE (~250ms later)
[3456571.580] wl_data_source#200.cancelled()

Result: Works, but duplicate events are still sent (GTK handles them gracefully).

Steps to reproduce

1. Open any file manager (cosmic-files or Nautilus)
2. Run with WAYLAND_DEBUG=1 to capture protocol messages
3. Drag any file or folder
4. Drop it
5. Observe duplicate leave() events in the log

For cosmic-files, the application will freeze after step 4.

Comparison with other compositors

Compositor	Duplicate leave events	cosmic-files DnD
Wayfire	❌ No	✅ Works perfectly
Hyprland 0.52.1	✅ Yes	❌ Freezes

Environment

• Hyprland: 0.52.1
• Kernel: 6.17.9-2-cachyos
• GPU: AMD Radeon RX 7900 XTX (Navi 31) + AMD Raphael iGPU
• Portal: xdg-desktop-portal-hyprland (also tested with xdg-desktop-portal-cosmic - same result)
• cosmic-files: 1.0.0.beta.5.r3.g2ba08c4-1 (git)
• cosmic-app-library: 1.0.0.beta.7-1.1
• Nautilus: (system version)
• Desktop: Arch Linux (CachyOS packages)

Possibly related issues

• Drag and drop does not work in Hyprland (Wayland) #7644 - Drag and drop does not work in Hyprland
• File drag and drop will hang mouse clicks #9472 - File drag and drop will hang mouse clicks
• drag & drop blocks input even after finshing #9154 - drag & drop blocks input even after finishing

Full WAYLAND_DEBUG logs

cosmic-files log (click to expand)

[2278447.268]  -> wl_data_device_manager#66.create_data_source(new id wl_data_source#164)
[2278447.275]  -> wl_data_source#164.offer("text/plain")
[2278447.278]  -> wl_data_source#164.offer("text/plain;charset=utf-8")
[2278447.279]  -> wl_data_source#164.offer("UTF8_STRING")
[2278447.281]  -> wl_data_source#164.offer("text/uri-list")
[2278447.282]  -> wl_data_source#164.offer("x-special/gnome-copied-files")
[2278447.283]  -> wl_data_source#164.set_actions(3)
[2278447.286]  -> wl_data_device#87.start_drag(wl_data_source#164, wl_surface#67, wl_surface#123, 1023)
[2278447.410] wl_data_device#87.data_offer(new id wl_data_offer#4278190082)
[2278447.413] wl_data_offer#4278190082.source_actions(3)
[2278447.415] wl_data_offer#4278190082.action(2)
[2278447.416] wl_data_offer#4278190082.offer("text/plain")
[2278447.417] wl_data_offer#4278190082.offer("text/plain;charset=utf-8")
[2278447.418] wl_data_offer#4278190082.offer("UTF8_STRING")
[2278447.420] wl_data_offer#4278190082.offer("text/uri-list")
[2278447.421] wl_data_offer#4278190082.offer("x-special/gnome-copied-files")
[2278447.422] wl_data_device#87.enter(1028, wl_surface#67, 236.00000000, 251.00000000, wl_data_offer#4278190082)
[2278447.439]  -> wl_data_offer#4278190082.set_actions(3, 2)
[2278447.443]  -> wl_data_offer#4278190082.accept(1, "x-special/gnome-copied-files")
[2278447.464] wl_data_source#164.target("x-special/gnome-copied-files")

# ... motion events omitted ...

[2279012.631] wl_data_device#87.drop()
[2279012.636] wl_data_device#87.leave()
[2279452.696] wl_data_device#87.leave()    # <-- DUPLICATE LEAVE EVENT

Nautilus log - first DnD (click to expand)

[3431529.120]  -> wl_data_device_manager#4.create_data_source(new id wl_data_source#118)
[3431529.125]  -> wl_data_source#118.offer("application/x-gtk-local-dnd")
[3431529.127]  -> wl_data_source#118.offer("text/plain;charset=utf-8")
[3431529.127]  -> wl_data_source#118.offer("text/uri-list")
[3431529.128]  -> wl_data_source#118.offer("application/vnd.portal.filetransfer")
[3431529.129]  -> wl_data_source#118.offer("application/vnd.portal.files")
[3431529.130]  -> wl_data_source#118.set_actions(7)
[3431529.132]  -> wl_data_device#31.start_drag(wl_data_source#118, wl_surface#40, wl_surface#119, 7610)
[3431530.712] wl_data_device#31.data_offer(new id wl_data_offer#4278190080)
[3431530.713] wl_data_offer#4278190080.source_actions(7)
[3431530.714] wl_data_offer#4278190080.action(2)
[3431530.715] wl_data_offer#4278190080.offer("application/x-gtk-local-dnd")
[3431530.716] wl_data_offer#4278190080.offer("text/plain;charset=utf-8")
[3431530.717] wl_data_offer#4278190080.offer("text/uri-list")
[3431530.718] wl_data_offer#4278190080.offer("application/vnd.portal.filetransfer")
[3431530.718] wl_data_offer#4278190080.offer("application/vnd.portal.files")
[3431530.719] wl_data_device#31.enter(7612, wl_surface#40, 235.00000000, 251.00000000, wl_data_offer#4278190080)

# ... motion events omitted ...

[3433611.264] wl_data_device#31.drop()
[3433611.269] wl_data_device#31.leave()
[3433611.361]  -> wl_data_offer#4278190080.set_actions(2, 2)
[3433611.365]  -> wl_data_offer#4278190080.accept(7612, "application/x-gtk-local-dnd")
[3433611.366]  -> wl_data_offer#4278190080.finish()
[3433611.367]  -> wl_data_offer#4278190080.destroy()
[3433611.512] wl_data_source#118.target("application/x-gtk-local-dnd")
[3433611.517] wl_data_device#31.leave()    # <-- DUPLICATE LEAVE EVENT
[3433611.519] wl_data_source#118.cancelled()
[3433611.529]  -> wl_data_source#118.destroy()

Nautilus log - second DnD (click to expand)

[3455699.732]  -> wl_data_device_manager#4.create_data_source(new id wl_data_source#200)
[3455699.738]  -> wl_data_source#200.offer("application/x-gtk-local-dnd")
[3455699.739]  -> wl_data_source#200.offer("text/plain;charset=utf-8")
[3455699.740]  -> wl_data_source#200.offer("text/uri-list")
[3455699.741]  -> wl_data_source#200.offer("application/vnd.portal.filetransfer")
[3455699.743]  -> wl_data_source#200.offer("application/vnd.portal.files")
[3455699.744]  -> wl_data_source#200.set_actions(7)
[3455699.746]  -> wl_data_device#31.start_drag(wl_data_source#200, wl_surface#40, wl_surface#195, 7686)
[3455701.237] wl_data_device#31.data_offer(new id wl_data_offer#4278190083)
[3455701.239] wl_data_offer#4278190083.source_actions(7)
[3455701.240] wl_data_offer#4278190083.action(2)
[3455701.240] wl_data_offer#4278190083.offer("application/x-gtk-local-dnd")
[3455701.241] wl_data_offer#4278190083.offer("text/plain;charset=utf-8")
[3455701.242] wl_data_offer#4278190083.offer("text/uri-list")
[3455701.243] wl_data_offer#4278190083.offer("application/vnd.portal.filetransfer")
[3455701.244] wl_data_offer#4278190083.offer("application/vnd.portal.files")
[3455701.245] wl_data_device#31.enter(7688, wl_surface#40, 235.00000000, 251.00000000, wl_data_offer#4278190083)

# ... motion events omitted ...

[3456571.328] wl_data_device#31.drop()
[3456571.331] wl_data_device#31.leave()
[3456571.435]  -> wl_data_offer#4278190083.set_actions(2, 2)
[3456571.437]  -> wl_data_offer#4278190083.accept(7688, "application/x-gtk-local-dnd")
[3456571.438]  -> wl_data_offer#4278190083.finish()
[3456571.438]  -> wl_data_offer#4278190083.destroy()
[3456571.578] wl_data_source#200.target("application/x-gtk-local-dnd")
[3456571.580] wl_data_device#31.leave()    # <-- DUPLICATE LEAVE EVENT
[3456571.580] wl_data_source#200.cancelled()
[3456571.586]  -> wl_data_source#200.destroy()

Summary

Hyprland consistently sends duplicate wl_data_device.leave() events after every drop() operation. This is observable with multiple applications and toolkits. While GTK applications handle this gracefully, libcosmic/iced applications freeze, making COSMIC desktop applications unusable for drag-and-drop on Hyprland.

[vaxerski]

I can't reproduce this.

[TheEnchantedPotato]

I have this problem with both cosmic-files and cosmic-app-library.
cosmic-files: If I drag a folder and drop it, the application freezes.
cosmic-app-library: If I try to move a desktop entry to a new category, it freezes.
The cause seems to be the duplicate wl_data_device.leave() event that Hyprland sends after drop(). I can see this clearly in the WAYLAND_DEBUG logs:

[vaxerski]

yeah but if I can't repro it, I can't really fix it. Feel free to make a MR yourself if you can reliably reproduce this