xwayland: Transform pointer enter event coordinates

Pointer enter event coordinates are surface relative and we need them to
be screen relative for pScreen->SetCursorPosition().

https://bugzilla.gnome.org/show_bug.cgi?id=758283

Signed-off-by: Rui Matos <tiagomatos@gmail.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Jonas Ådahl <jadahl@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

hw/xwayland/xwayland-input.c

@@ -298,6 +298,7 @@ pointer_handle_enter(void *data, struct wl_pointer *pointer,
     int i;
     int sx = wl_fixed_to_int(sx_w);
     int sy = wl_fixed_to_int(sy_w);
+    int dx, dy;
     ScreenPtr pScreen = xwl_seat->xwl_screen->screen;
     ValuatorMask mask;
 
@@ -314,9 +315,11 @@ pointer_handle_enter(void *data, struct wl_pointer *pointer,
     xwl_seat->pointer_enter_serial = serial;
 
     xwl_seat->focus_window = wl_surface_get_user_data(surface);
+    dx = xwl_seat->focus_window->window->drawable.x;
+    dy = xwl_seat->focus_window->window->drawable.y;
 
     master = GetMaster(dev, POINTER_OR_FLOAT);
-    (*pScreen->SetCursorPosition) (dev, pScreen, sx, sy, TRUE);
+    (*pScreen->SetCursorPosition) (dev, pScreen, dx + sx, dy + sy, TRUE);
 
     miPointerInvalidateSprite(master);