[gtk/wip/chergert/macos-decelerate] macos: fix typo when creating scroll events

[Christian Hergert <chergert src gnome org>]

commit 115ea624d9ce9c77e9bcf0b5dcca6784f70ab727
Author: Christian Hergert <chergert redhat com>
Date:   Thu Dec 3 13:44:14 2020 -0800

    macos: fix typo when creating scroll events
    
    This fixes an issue where we would ignore events with Y delta
    and no X delta while scrolling due to a typo when checking for
    any delta.
    
    This fixes deceleration of kinetic scrolling on the macOS backend.
    
    Fixes #3418

 gdk/macos/gdkmacosdisplay-translate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gdk/macos/gdkmacosdisplay-translate.c b/gdk/macos/gdkmacosdisplay-translate.c
index f895db9686..5f5eeffdcf 100644
--- a/gdk/macos/gdkmacosdisplay-translate.c
+++ b/gdk/macos/gdkmacosdisplay-translate.c
@@ -610,7 +610,7 @@ fill_scroll_event (GdkMacosDisplay *self,
       sx = [nsevent scrollingDeltaX];
       sy = [nsevent scrollingDeltaY];
 
-      if (sx != 0.0 || dx != 0.0)
+      if (sx != 0.0 || sy != 0.0)
         ret = gdk_scroll_event_new (GDK_SURFACE (surface),
                                     pointer,
                                     NULL,