[mutter/wip/carlosg/fix-pad-osds-position: 1/2] backends/x11: Implement is_grouped for X11

[Carlos Garnacho <carlosg src gnome org>]

commit 664bbf1deaeab108b1193cfb9590ee5db5fe5376
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Feb 12 20:26:56 2020 +0100

    backends/x11: Implement is_grouped for X11
    
    If the devices have a wacom description, compare those. Otherwise,
    look up the devices' VID:PID, if they match they should also be
    grouped.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/971

 src/backends/x11/meta-input-device-x11.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
---
diff --git a/src/backends/x11/meta-input-device-x11.c b/src/backends/x11/meta-input-device-x11.c
index 26a40620f..ba31c65f7 100644
--- a/src/backends/x11/meta-input-device-x11.c
+++ b/src/backends/x11/meta-input-device-x11.c
@@ -92,6 +92,31 @@ static gboolean
 meta_input_device_x11_is_grouped (ClutterInputDevice *device,
                                   ClutterInputDevice *other_device)
 {
+#ifdef HAVE_LIBWACOM
+  MetaInputDeviceX11 *device_x11 = META_INPUT_DEVICE_X11 (device);
+  MetaInputDeviceX11 *other_device_x11 = META_INPUT_DEVICE_X11 (other_device);
+
+  if (device_x11->wacom_device &&
+      other_device_x11->wacom_device &&
+      libwacom_compare (device_x11->wacom_device,
+                        other_device_x11->wacom_device,
+                        WCOMPARE_NORMAL) == 0)
+    return TRUE;
+#endif
+
+  /* Devices with the same VID:PID get grouped together */
+  if (clutter_input_device_get_vendor_id (device) &&
+      clutter_input_device_get_product_id (device) &&
+      clutter_input_device_get_vendor_id (other_device) &&
+      clutter_input_device_get_product_id (other_device))
+    {
+      if (strcmp (clutter_input_device_get_vendor_id (device),
+                  clutter_input_device_get_vendor_id (other_device)) == 0 &&
+          strcmp (clutter_input_device_get_product_id (device),
+                  clutter_input_device_get_product_id (other_device)) == 0)
+        return TRUE;
+    }
+
   return FALSE;
 }