[mutter/wip/rstrode/rhel-8.0.0: 114/117] clutter: Only reset scroll axes on slave devices

[Ray Strode <halfline src gnome org>]

commit 0dccf69cb3abfbd742d0102728a5662d905632ce
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jun 13 13:48:24 2018 +0200

    clutter: Only reset scroll axes on slave devices
    
    As a plus, unknown source device IDs will just warn instead of crash.

 clutter/clutter/x11/clutter-device-manager-xi2.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/clutter/clutter/x11/clutter-device-manager-xi2.c 
b/clutter/clutter/x11/clutter-device-manager-xi2.c
index 6794a2e0c..0718cd975 100644
--- a/clutter/clutter/x11/clutter-device-manager-xi2.c
+++ b/clutter/clutter/x11/clutter-device-manager-xi2.c
@@ -1819,7 +1819,8 @@ clutter_device_manager_xi2_translate_event (ClutterEventTranslator *translator,
             _clutter_input_device_set_stage (device, NULL);
           }
 
-        _clutter_input_device_reset_scroll_info (source_device);
+        if (clutter_input_device_get_device_mode (source_device) == CLUTTER_INPUT_MODE_SLAVE)
+          _clutter_input_device_reset_scroll_info (source_device);
 
         clutter_event_set_device (event, device);
         clutter_event_set_source_device (event, source_device);