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[desktop_drop] Linux: prefer text/uri-list over the portal transfer target #501

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[desktop_drop] Linux: prefer text/uri-list over the portal transfer target #501

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9dc4d5c
[desktop_drop] Linux: prefer text/uri-list over the portal transfer t…
mx1up Sep 5, 2026
8749615
[desktop_drop] changelog: link the PR
mx1up Sep 5, 2026
63da272
honor release policy (reserved for maintainer)
mx1up Sep 7, 2026
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29 changes: 22 additions & 7 deletions packages/desktop_drop/linux/desktop_drop_plugin.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -112,14 +112,29 @@ void desktop_drop_plugin_register_with_registrar(FlPluginRegistrar *registrar) {
g_object_new(desktop_drop_plugin_get_type(), nullptr));

auto *fl_view = fl_plugin_registrar_get_view(registrar);
// Register portal file transfer target FIRST (highest priority)
// then STRING, then URI targets
static GtkTargetEntry entries[] = {
{strdup("application/vnd.portal.filetransfer"), GTK_TARGET_OTHER_APP, 0},
{strdup("STRING"), GTK_TARGET_OTHER_APP, 0}
};
gtk_drag_dest_set(GTK_WIDGET(fl_view), GTK_DEST_DEFAULT_ALL, entries, 2, GDK_ACTION_COPY);
// Match `text/uri-list` before `application/vnd.portal.filetransfer`.
//
// GTK picks the first destination target the drag source also offers, so
// whichever target is registered first wins. The portal transfer key is
// only resolvable when the source is sandboxed and has actually registered
// a FileTransfer with the document portal. File managers such as Dolphin
// and dde-fileManager advertise `application/vnd.portal.filetransfer` on
// plain X11 drags as well, where `RetrieveFiles` then rejects the key with
// `org.freedesktop.DBus.Error.AccessDenied: Invalid transfer` and the drop
// is silently lost. Register the URI targets first and keep the portal key
// (and a bare STRING) as fallbacks for sources that offer nothing better.
gtk_drag_dest_set(GTK_WIDGET(fl_view), GTK_DEST_DEFAULT_ALL, nullptr, 0,
GDK_ACTION_COPY);
gtk_drag_dest_add_uri_targets(GTK_WIDGET(fl_view));
GtkTargetList *target_list = gtk_drag_dest_get_target_list(GTK_WIDGET(fl_view));
if (target_list != nullptr) {
gtk_target_list_add(
target_list,
gdk_atom_intern_static_string("application/vnd.portal.filetransfer"),
GTK_TARGET_OTHER_APP, 0);
gtk_target_list_add(target_list, gdk_atom_intern_static_string("STRING"),
GTK_TARGET_OTHER_APP, 0);
}

g_autoptr(FlStandardMethodCodec) codec = fl_standard_method_codec_new();
FlMethodChannel *channel =
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