old custom_widget. Custom_widget does not get destroyed when the
tooltip goes away.
+* JPEG2000 support is no longer enabled by default. It must be
+ explicitly turned on, by passing --with-libjasper to configure.
+
+* GDK has been reworked to implement 'client-side windows'. This offers
+ exciting new possibilities, such as transformed, offscreen rendering,
+ but it breaks some long-standing assumptions that applications may
+ have about GDK windows. Setting the environment variable
+ GDK_NATIVE_WINDOWS makes GDK create a native X11 window for each
+ GDK window, which might make problematic applications work better.
+
Release notes for 2.16
======================