mate-desktop/mate-panel — pull request #196 by dnk (2014-05-15 18:30:25+00:00)
Title: gtk3: remove transparent hack

background widget is hack to change background for some widget.
background should be :
* for MATE_PANEL_APPLET_OUT_PROCESS_FACTORY applets changed for applet window
* for MATE_PANEL_APPLET_IN_PROCESS_FACTORY applets have no own window and they are drawn on panel window