public Region region_intersect (Region region)
Warning: region_intersect is deprecated since 3.14.
Computes the intersection of a this’s area and
region, returning the intersection.
The result may be empty, use is_empty to check.
a Region, in the same coordinate system as this- >allocation. That is, relative to this->window for widgets which return false from get_has_window; relative to the parent window of this->window otherwise.
A newly allocated region holding the intersection of this and