[jds-review] Please review the patch to fix gtkmm build error after upgrade tarball to 2.13.4

[C Wang]

our C++ compiler is not happy with the following line of code
return
(Allocation)(Glib::wrap(&gtk_widget_get_allocation(const_cast<GtkWidget*>(gobj()))));

and reported error

The "&" operator can only be applied to a variable or other l-value.

What the author want to do is to get the address of the return value of 
gtk_widget_get_allocation, to
avoid the problem, simply split the code to

  GtkAllocation ga =gtk_widget_get_allocation(const_cast<GtkWidget*>(gobj()));
  return (Allocation)(Glib::wrap(&ga));

Chris




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