widget: Avoid uninitialized access

Initialize all field in the GtkCrossingData struct
when synthesizing crossing events.

Fixes: #2743

diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 857aa9ac628cc4a6916135eddefe3165719c7ca6..1134e4a97964a58210aff04947e88ab9ea0339c5 100644 (file)
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -7539,9 +7539,11 @@ _gtk_widget_synthesize_crossing (GtkWidget       *from,
   g_return_if_fail (from != NULL || to != NULL);
 
   crossing.type = GTK_CROSSING_POINTER;
+  crossing.mode = mode;
   crossing.old_target = from;
+  crossing.old_descendent = NULL;
   crossing.new_target = to;
-  crossing.mode = mode;
+  crossing.new_descendent = NULL;
 
   if (from)
     {