ANNOUNCE: libxfce4ui 4.15.6 released

[Simon Steinbeiss]

libxfce4ui 4.15.6 is now available for download from
  
  https://archive.xfce.org/src/xfce/libxfce4ui/4.15/libxfce4ui-4.15.6.tar.bz2
  https://archive.xfce.org/src/xfce/libxfce4ui/4.15/libxfce4ui-4.15.6.tar.bz2?sha1
  https://archive.xfce.org/src/xfce/libxfce4ui/4.15/libxfce4ui-4.15.6.tar.bz2?sha256


What is libxfce4ui?
===================

Libxfce4ui is used to share commonly used Xfce widgets among the Xfce
applications.

Website: 
  https://www.xfce.org/


Release notes for 4.15.6
========================
[Please note that this is a development release.]
- Introduce xfce_spawn and xfce_spawn_command_line
  in favor and instead of xfce_spawn_no_child
- Bump GLib (and gio, gthread, etc) minimum to 2.50.0
- about: Support multiple GPUs and print GPU memory size
- about: Drop window subtitle
- Always perform sanity check
- Avoid checking for epoxy if libgtop is disabled
- XfceTitledDialog: Fix erroneous check (Fixes #30)
- No startup notification in Wayland to prevent crash (Issue #17)
- Translation Updates:
  Chinese (China), Chinese (Taiwan), Estonian, French, German, Hebrew,
  Indonesian, Italian, Japanese, Lithuanian, Norwegian Bokmål,
  Portuguese, Portuguese (Brazil), Russian, Serbian, Spanish, Swedish,
  Turkish