The GNOME developers behind the Mutter window manager application for the GNOME desktop environment, announced the unstable 3.9.4 release on July 10, 2013.
Among the new features implemented in Mutter 3.9.4, we can mention that the window shadows have been tweaked, as well as two new APIs, one to query if the stage is focused, and the other one to query the monitor for a given position.
Mutter 3.9.4 also allows slicing of backgrounds to avoid texture size, ignores its own focus events for focus prediction, and no longer forces attached dialogs to be border-only.
Various other small bugs have been squashed in this development release of the Mutter window manager for the GNOME desktop environment. For more details, please read the official raw changelog.
Download Mutter 3.9.4 right now from Softpedia. Remember that this is a development version and it should NOT be installed on production machines. It is intended for testing purposes only.