
Implement MetaDnd for emitting DnD signals to plugins such as gnome-shell. The xdnd handling code comes from gnome-shell, and it is hidden behind MetaDnd now. https://bugzilla.gnome.org/show_bug.cgi?id=765003
Intro ===== Fix me. Env Vars ======== MUTTER_DISABLE_MIPMAPS - set to disable use of mipmaped windows.