Adds a Graphviz graph in the workflows->edit view which displays the selected workflow.
Index: app/helpers/workflows_helper.rb
===================================================================
--- app/helpers/workflows_helper.rb	(revision 4574)
+++ app/helpers/workflows_helper.rb	(working copy)
@@ -16,4 +16,11 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 module WorkflowsHelper
+  def generate_workflow_graph(role, tracker)
+    edges = role.workflows.inject("") do |edge, workflow|
+      workflow.tracker_id == tracker.id ? "#{edge}#{workflow.old_status}->#{workflow.new_status};" : edge
+    end
+    
+    "http://chart.apis.google.com/chart?cht=gv&chl=digraph{#{CGI.escape(edges.gsub(/ /, '_').toutf8)}}&chs=547x547"
+  end
 end
Index: app/views/workflows/edit.rhtml
===================================================================
--- app/views/workflows/edit.rhtml	(revision 4574)
+++ app/views/workflows/edit.rhtml	(working copy)
@@ -71,3 +71,5 @@
 <% end %>
 
 <% html_title(l(:label_workflow)) -%>
+
+<%= image_tag(generate_workflow_graph(@role, @tracker)) if @role %>