[gtk/for-master: 1/2] Copy axes when rewriting events

[Emmanuele Bassi <ebassi src gnome org>]

commit d46e1288a4fb7ec928829b55f5c724376ba19382
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Apr 17 22:23:32 2020 +0100

    Copy axes when rewriting events

 gtk/gtkmain.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkmain.c b/gtk/gtkmain.c
index e1ec1a994d..cbb09c802c 100644
--- a/gtk/gtkmain.c
+++ b/gtk/gtkmain.c
@@ -1084,6 +1084,8 @@ rewrite_event_for_surface (GdkEvent  *event,
   GdkEventType type;
   double x, y;
   double dx, dy;
+  double *axes = NULL;
+  guint n_axes = 0;
 
   type = gdk_event_get_event_type (event);
 
@@ -1106,6 +1108,16 @@ rewrite_event_for_surface (GdkEvent  *event,
       break;
     }
 
+  if (gdk_event_get_axes (event, &axes, &n_axes))
+    {
+      double *axes_copy = g_memdup (axes, n_axes * sizeof (double));
+
+      /* The newly created event takes ownership of the axes, so
+       * we need a copy
+       */
+      axes = axes_copy;
+    }
+
   switch ((guint) type)
     {
     case GDK_BUTTON_PRESS:
@@ -1119,7 +1131,7 @@ rewrite_event_for_surface (GdkEvent  *event,
                                    gdk_event_get_modifier_state (event),
                                    gdk_button_event_get_button (event),
                                    x, y,
-                                   NULL); // FIXME copy axes
+                                   axes);
     case GDK_MOTION_NOTIFY:
       return gdk_motion_event_new (new_surface,
                                    gdk_event_get_device (event),
@@ -1128,7 +1140,7 @@ rewrite_event_for_surface (GdkEvent  *event,
                                    gdk_event_get_time (event),
                                    gdk_event_get_modifier_state (event),
                                    x, y,
-                                   NULL); // FIXME copy axes
+                                   axes);
     case GDK_TOUCH_BEGIN:
     case GDK_TOUCH_UPDATE:
     case GDK_TOUCH_END:
@@ -1141,7 +1153,7 @@ rewrite_event_for_surface (GdkEvent  *event,
                                   gdk_event_get_time (event),
                                   gdk_event_get_modifier_state (event),
                                   x, y,
-                                  NULL, // FIXME copy axes
+                                  axes,
                                   gdk_touch_event_get_emulating_pointer (event));
     case GDK_TOUCHPAD_SWIPE:
       gdk_touchpad_event_get_deltas (event, &dx, &dy);