Under Wayland the window is native but arboard was built without its
data-control backend, so it read the X11 clipboard through XWayland,
which only holds what X11 apps copied: Paste found nothing and reported
an empty clipboard (egui's text paste into fields uses smithay-clipboard,
which is why that worked). arboard now has `wayland-data-control`, the
same as PhotoCraft; it falls back to X11 where the compositor lacks the
protocol (GNOME's Mutter).
The reporter's clipboard also held text/uri-list: with a file copied in a
file manager, Paste would have taken the path as text before the bitmap.
Copied files now paste first, as the first one that is art (SVG, PDF,
EMF/WMF or a bitmap), told from its first 4 KiB by the engine's format
detection (`clipboard::file_flavour`): text/uri-list through arboard on
Linux and macOS (a trailing CR from CRLF lists trimmed), CF_HDROP on
Windows, read with the clipboard closed again.
Dropping files on the window can't work under Wayland yet: winit 0.30,
which eframe 0.36 runs on, has no Wayland drag and drop (winit#1881,
added in 0.31), so no dropped_files arrive. docs/development.md documents
it and the workarounds (copy and paste the files, File > Place, or run
under XWayland with `WAYLAND_DISPLAY=`).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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