a70823dd1c
Add a function to check whether a point is inside a quadrilateral by checking the cross product of vectors with the quadrilateral points, and the point being checked. If the passed quadrilateral is zero-sized, no point is ever reported to be inside it. This will be used by the next commit when comparing the transformed actor vertices. [feaneron: add a commit message and remove unecessary code] https://gitlab.gnome.org/GNOME/mutter/merge_requests/189