Patch by Jonathan R. Santos to draw active regions for nested calls. (With unaxpanded tabs and some comments added).
Patch by Jonathan R. Santos to draw active regions for nested calls.
(With unaxpanded tabs and some comments added).

davidmoten/UMLGraph,Edd123/UMLGraph,Edd123/UMLGraph,dspinellis/UMLGraph,davidmoten/UMLGraph,Edd123/UMLGraph,dspinellis/UMLGraph,dspinellis/UMLGraph,davidmoten/UMLGraph