[Gambas-bugtracker] Bug #1979: The background color of ToolButton is incorrect display in GB.GTK3 component

[bugtracker at gambaswiki.org]

http://gambaswiki.org/bugtracker/edit?object=BUG.1979&from=L21haW4-

Comment #4 by Benoît MINISINI:

I forgot to say: the background color of a Tooltip button may or not be visible, depending on the widget theme in use.