2.23.21
=======

Thanks to Robert Escriva, Iain Holmes, Matt Krai, Thomas Thurman,
and Chris Wang for improvements in this version.

  - Add shadow ability for menus and tooltips (Iain) (#517442) (#517524)
  - Fix possible crashes in compositor (Iain) (#534569) (#528787)
  - Major reorganisation of compositor code (Iain)
  - Initial version of XRender backend for the compositor (Iain)
  - New basic public API for compositor (Iain)
  - Window decoration updates colour when GTK theme changes (Robert) (#511826)
  - Minor code cleanup for pedantic compilers (Thomas)
  - Further code cleanup for pedantic compilers (Matt) (#526049)
  - The atom list appears only once in the code (Thomas) (#530843)
  - Don't attempt to read attributes of invalid windows (Chris) (#530485)

Translations
  Khaled Hosny (ar), Gabor Kelemen (hu), Kjartan Maraas (nb), Tino Meinen (nl),
  Theppitak Karoonboonyanan (th)