[libadwaita/libadwaita-1-1] swipe-tracker: Skip hold events

[Alexander Mikhaylenko <alexm src gnome org>]

commit 083e2ea144254e7246263837772f07df60c45339
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Jul 22 21:30:44 2022 +0400

    swipe-tracker: Skip hold events
    
    
    (cherry picked from commit 33c9492aae088c84491fd0a280ec98f7c06ceb01)

 src/adw-swipe-tracker.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/adw-swipe-tracker.c b/src/adw-swipe-tracker.c
index 384fb2c0..bab9dbcf 100644
--- a/src/adw-swipe-tracker.c
+++ b/src/adw-swipe-tracker.c
@@ -675,6 +675,9 @@ handle_scroll_event (AdwSwipeTracker *self,
   is_vertical = (self->orientation == GTK_ORIENTATION_VERTICAL);
   distance = is_vertical ? TOUCHPAD_BASE_DISTANCE_V : TOUCHPAD_BASE_DISTANCE_H;
 
+  if (!event || gdk_event_get_event_type (event) != GDK_SCROLL)
+    return GDK_EVENT_PROPAGATE;
+
   if (gdk_scroll_event_get_direction (event) != GDK_SCROLL_SMOOTH)
     return GDK_EVENT_PROPAGATE;