The draw property of type :boolean (Read / Write) Whether the separator is drawn, or just blank. Default value: true
Details
The gtk:separator-tool-item widget is a gtk:tool-item widget that separates groups of other gtk:tool-item widgets.
Depending on the theme, a separator tool item will often look like a vertical
line on horizontally docked toolbars.
If the expand child property of the gtk:toolbar widget is true and the draw property is false, a separator tool item
will act as a "spring" that forces other items to the ends of the toolbar.