GDK W32: Make sure drag source window is not NULL

This prevents GTK from throwing a bunch of warnings when it tries
to get drag source window -> screen of that window -> ipc widget for that screen,
and then tries to attach a signal handler to that widget.

Specifically, this happens when we get a DnD move from another
application.

https://bugzilla.gnome.org/show_bug.cgi?id=786509
parent 3fd23fcf
......@@ -575,6 +575,8 @@ idroptarget_dragenter (LPDROPTARGET This,
*/
if (current_src_context && current_src_context->context)
g_set_object (&context->source_window, current_src_context->context->source_window);
else
g_set_object (&context->source_window, gdk_get_default_root_window ());
g_set_object (&sel_win32->target_drag_context, context);
context->actions = GDK_ACTION_DEFAULT | GDK_ACTION_COPY | GDK_ACTION_MOVE;
......
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