Drag-and-drop from Nautilus does not work on Wayland

[ac999]

Description

Dragging files from Nautilus (GNOME Files) into the KeibiDrop Rust UI window does not trigger the drop handler on Wayland.

Steps to Reproduce

1. Launch keibidrop-rust on Ubuntu with Wayland
2. Open Nautilus, select a file
3. Drag the file onto the KeibiDrop window
4. Nothing happens — file is not added

Expected Behavior

File should be added to the shared file list (same as using the + button).

Environment

• Ubuntu, Wayland compositor
• Slint 1.14.1 with backend-winit

Notes

The winit DroppedFile event handler exists in rust/src/main.rs (line ~810) and works on X11 and macOS. This is likely a Slint/winit Wayland limitation.

[ac999]

Root Cause Analysis

This is an upstream winit limitation, not a KeibiDrop bug.

winit 0.30.x does not implement DroppedFile/HoveredFile events on its Wayland backend. The events simply never fire. This is tracked in:

• winit #1881 — open since March 2021
• winit #4504 — active PR to fix this (uses SCTK DataDeviceManager)

Our handler at rust/src/main.rs:848-889 is correct and works on X11 and macOS. The Wayland backend just doesn't emit the events.

Workaround

Force the app to run under XWayland (where X11 DnD works):

WINIT_UNIX_BACKEND=x11 ./rust/target/release/keibidrop-rust

Trade-off: slightly worse rendering on HiDPI (no fractional scaling).

Status

• Not fixable in our code — waiting on winit PR #4504
• Multi-file picker (Add file picker only allows single file selection #99) provides an alternative way to add files
• DnD will auto-fix when winit merges the PR and we update dependencies

[marius-cristian]

i am curious if we can use qt engine without paying the paid license