Fix gtk3 to workaround XI2 + reparenting WMs scroll issues

gtk-fix-xi2-scroll-issues.patch

diff -ur gtk+-3.24.29.bak/gdk/x11/gdkdevicemanager-xi2.c gtk+-3.24.29/gdk/x11/gdkdevicemanager-xi2.c
--- gtk+-3.24.29.bak/gdk/x11/gdkdevicemanager-xi2.c	2021-12-12 01:07:35.648699240 -0800
+++ gtk+-3.24.29/gdk/x11/gdkdevicemanager-xi2.c	2021-12-12 01:07:45.812571463 -0800
@@ -37,6 +37,7 @@
 #include <X11/Xatom.h>
 
 #include <string.h>
+#include <bsd/sys/time.h>
 
 static const char *wacom_type_atoms[] = {
   "STYLUS",
@@ -66,6 +67,7 @@
   gint opcode;
   gint major;
   gint minor;
+    struct timespec last_leave;
 };
 
 struct _GdkX11DeviceManagerXI2Class
@@ -156,6 +158,7 @@
                                                     g_direct_equal,
                                                     NULL,
                                                     (GDestroyNotify) g_object_unref);
+  memset(&device_manager->last_leave, 0, sizeof(struct timespec));
 }
 
 static void
@@ -1985,7 +1988,17 @@
         gdk_event_set_source_device (event, source_device);
         gdk_event_set_seat (event, gdk_device_get_seat (device));
 
-        if (ev->evtype == XI_Enter &&
+        int allow_reset = 0;
+        if (ev->evtype == XI_Leave) {
+            clock_gettime(CLOCK_MONOTONIC, &device_manager->last_leave);
+        } else {
+            struct timespec temp, out;
+            clock_gettime(CLOCK_MONOTONIC, &temp);
+            timespecsub(&temp, &device_manager->last_leave, &out);
+            allow_reset = out.tv_sec > 0 || out.tv_nsec > 10000000; // 10ms
+        }
+
+        if (allow_reset &&
             xev->detail != XINotifyInferior && xev->mode != XINotifyPassiveUngrab &&
 	    gdk_window_get_window_type (window) == GDK_WINDOW_TOPLEVEL)
           {