gtk-widget-path-iter-add-region (path pos name flags)

path -- a gtk-widget-path instance
pos -- an integer with the position to modify, -1 for the path head
name -- a string with the region name
flags -- a gtk-region-flags value affecting the region

Adds the region name to the widget at position pos in the hierarchy defined in path. See the gtk-style-context-add-region function. Region names must only contain lowercase letters and '-', starting always with a lowercase letter. The gtk-widget-path-iter-add-region function has been deprecated since version 3.14 and should not be used in newly written code. The use of regions is deprecated.