From 351f04e42c31d9c06274250988d05b439d50df2b Mon Sep 17 00:00:00 2001
From: Carlos Garnacho <carlosg@gnome.org>
Date: Wed, 13 Jun 2018 13:48:24 +0200
Subject: [PATCH] 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);
-- 
2.20.1