Check horizontal touch slop for non-vertical flings

Flag: com.android.launcher3.enable_gesture_nav_horizontal_touch_slop
Fixes: 394364217
Test: Tested overview gesture with slight horizontal fling at the end
Change-Id: Ifb716b58486dd0bfadee467978b85150525af333
diff --git a/aconfig/launcher.aconfig b/aconfig/launcher.aconfig
index c564594..9aee58f 100644
--- a/aconfig/launcher.aconfig
+++ b/aconfig/launcher.aconfig
@@ -653,3 +653,13 @@
   description: "Enable more grid scale options on the launcher for desktop experience"
   bug: "375491272"
 }
+
+flag {
+  name: "enable_gesture_nav_horizontal_touch_slop"
+  namespace: "launcher"
+  description: "Enables horizontal touch slop checking in non-vertical fling navigation gestures"
+  bug: "394364217"
+  metadata {
+    purpose: PURPOSE_BUGFIX
+  }
+}