gnome: correctly show which camera is selected

Refs #69140

Change-Id: I37dac6e67ce47f36766856744f101e2fcc963421

src/video/video_widget.cpp

@@ -277,6 +277,7 @@ on_drag_data_received(G_GNUC_UNUSED GtkWidget *self,
 static void
 switch_video_input(G_GNUC_UNUSED GtkWidget *widget, Video::Device *device)
 {
+    Video::DeviceModel::instance()->setActive(device);
     Video::SourceModel::instance()->switchTo(device);
 }
 
@@ -339,6 +340,9 @@ on_button_press_in_screen_event(G_GNUC_UNUSED GtkWidget *widget,
         g_signal_connect(item, "activate", G_CALLBACK(switch_video_input), device);
     }
 
+    /* add separator */
+    gtk_menu_shell_append(GTK_MENU_SHELL(menu), gtk_separator_menu_item_new());
+
     /* add screen area as an input */
     GtkWidget *item = gtk_check_menu_item_new_with_mnemonic("Share screen area");
     gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);