A #GtkSeparatorToolItem is a #GtkToolItem that separates groups of other #GtkToolItems. Depending on the theme, a #GtkSeparatorToolItem will often look like a vertical line on horizontally docked toolbars.
Fluent builder for gtk.separator_tool_item.SeparatorToolItem
Fluent builder implementation template for gtk.separator_tool_item.SeparatorToolItem
Module for SeparatorToolItem class