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wayland/data-device: Clear existing data device resource from list

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Compositor behaviour when calling `wl_data_device_manager_get_data_device`
for the same seat multiple times is not very clearly defined in
the spec and both Mutter and Weston currently don't handle
the DnD case properly.

While Weston handles DnD only for the last created data device,
Mutter, because of some internal reshuffling, ends up toggling
between two devices.

Properly handling this case requires some bigger changes. So
in order to behave predictable and in line with Weston,
only take the last created data device into account while
still keeping the previous created ones around.

The main affect client here is Firefox, which gets very
confused by the toggling behaviour and becomes more stable
with this patch.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1841>
This commit is contained in:
Robert Mader 2021-04-25 19:03:38 +02:00
parent 8989c42d40
commit 96f2da9fb0
1 changed files with 10 additions and 0 deletions
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10
src/wayland/meta-wayland-data-device.c
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@ -1016,9 +1016,19 @@ get_data_device (struct wl_client *client,
{
MetaWaylandSeat *seat = wl_resource_get_user_data (seat_resource);
struct wl_resource *cr;
struct wl_resource *data_device_resource;
cr = wl_resource_create (client, &wl_data_device_interface, wl_resource_get_version (manager_resource), id);
wl_resource_set_implementation (cr, &data_device_interface, &seat->data_device, unbind_resource);
data_device_resource =
wl_resource_find_for_client (&seat->data_device.resource_list, client);
if (data_device_resource)
{
wl_list_remove (wl_resource_get_link (data_device_resource));
wl_list_init (wl_resource_get_link (data_device_resource));
}
wl_list_insert (&seat->data_device.resource_list, wl_resource_get_link (cr));
ensure_owners_changed_handler_connected (&seat->data_device);