[mutter] virtual-input-device/native: Emit added/removed events

[Marge Bot <marge-bot src gnome org>]

commit 671bda25096ba1347efed012e5d4403f436c47d2
Author: Jonas Ådahl <jadahl gmail com>
Date:   Tue Jan 26 22:42:27 2021 +0100

    virtual-input-device/native: Emit added/removed events
    
    Without these devices, things that depend on the existance of input
    device classes won't know about the existance of e.g. pointer devices,
    if the only pointer device is from a virtual one.
    
    This requires handling situations where e.g. a device doesn't have a
    device node thus can't be matched against a udev device.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1688>

 src/backends/meta-input-mapper.c                       |  3 +++
 src/backends/native/meta-virtual-input-device-native.c | 10 ++++++++++
 2 files changed, 13 insertions(+)
---
diff --git a/src/backends/meta-input-mapper.c b/src/backends/meta-input-mapper.c
index 2250cb5dfe..2a41a75088 100644
--- a/src/backends/meta-input-mapper.c
+++ b/src/backends/meta-input-mapper.c
@@ -386,6 +386,9 @@ input_device_get_physical_size (MetaInputMapper    *mapper,
   const char *node;
 
   node = clutter_input_device_get_device_node (device);
+  if (!node)
+    return FALSE;
+
   udev_device = g_udev_client_query_by_device_file (mapper->udev_client, node);
 
   if (udev_device &&
diff --git a/src/backends/native/meta-virtual-input-device-native.c 
b/src/backends/native/meta-virtual-input-device-native.c
index 9291d3f3d3..e6d9f47dfc 100644
--- a/src/backends/native/meta-virtual-input-device-native.c
+++ b/src/backends/native/meta-virtual-input-device-native.c
@@ -162,6 +162,7 @@ release_device_in_impl (GTask *task)
   MetaSeatImpl *seat_impl;
   int code;
   uint64_t time_us;
+  ClutterEvent *device_event;
 
   device_native = META_INPUT_DEVICE_NATIVE (impl_state->device);
   seat_impl = meta_input_device_native_get_seat_impl (device_native);
@@ -198,6 +199,10 @@ release_device_in_impl (GTask *task)
         }
     }
 
+  device_event = clutter_event_new (CLUTTER_DEVICE_REMOVED);
+  clutter_event_set_device (device_event, impl_state->device);
+  _clutter_event_push (device_event, FALSE);
+
   g_clear_object (&impl_state->device);
   g_task_return_boolean (task, TRUE);
 
@@ -1006,6 +1011,7 @@ meta_virtual_input_device_native_constructed (GObject *object)
   MetaVirtualInputDeviceNative *virtual_evdev =
     META_VIRTUAL_INPUT_DEVICE_NATIVE (object);
   ClutterInputDeviceType device_type;
+  ClutterEvent *device_event = NULL;
 
   device_type = clutter_virtual_input_device_get_device_type (virtual_device);
 
@@ -1018,6 +1024,10 @@ meta_virtual_input_device_native_constructed (GObject *object)
     meta_input_device_native_new_virtual (virtual_evdev->seat->impl,
                                           device_type,
                                           CLUTTER_INPUT_MODE_PHYSICAL);
+
+  device_event = clutter_event_new (CLUTTER_DEVICE_ADDED);
+  clutter_event_set_device (device_event, virtual_evdev->impl_state->device);
+  _clutter_event_push (device_event, FALSE);
 }
 
 static void