control: dbus: emit events properly on input change

The can-seek and can-pause variables could end up
not being set, as the callback events are not reliably
fired in case the variables changed before the callbacks
are attached.
Additionally we need to report the playback status properly
whenever a new item starts playing.

Fix #24699

modules/control/dbus/dbus.c

@@ -541,14 +541,32 @@ static void ProcessEvents( intf_thread_t *p_intf,
         switch( p_events[i]->signal )
         {
         case SIGNAL_ITEM_CURRENT:
+        {
             TrackChange( p_intf );
 
+            // Update status when new item starts playing
+            // Just relying on the variables change callbacks is not enough
+            // as by the time the callbacks are attached, we might already
+            // have missed a change, so we need to query and set the initial
+            // values reliably here.
+            vlc_dictionary_insert( &player_properties, "PlaybackStatus", NULL );
+            input_thread_t *p_input = pl_CurrentInput( p_intf );
+            if( p_input )
+            {
+                if ( var_GetBool( p_input, "can-pause" ) )
+                    vlc_dictionary_insert( &player_properties, "CanPause", NULL );
+                if ( var_GetBool( p_input, "can-seek" ) )
+                    vlc_dictionary_insert( &player_properties, "CanSeek", NULL );
+                vlc_object_release( p_input );
+            }
+
             // rate depends on current item
             if( !vlc_dictionary_has_key( &player_properties, "Rate" ) )
                 vlc_dictionary_insert( &player_properties, "Rate", NULL );
 
             vlc_dictionary_insert( &player_properties, "Metadata", NULL );
             break;
+        }
         case SIGNAL_PLAYLIST_ITEM_APPEND:
         case SIGNAL_PLAYLIST_ITEM_DELETED:
         {