Fix merge conflict with rebase

lib/rgl/rdot.rb

@@ -11,6 +11,10 @@ module DOT
     # https://www.graphviz.org/Documentation/dotguide.pdf
     # January 5, 2015
 
+    # attributes due to
+    # https://www.graphviz.org/Documentation/dotguide.pdf
+    # January 5, 2015
+
     # options for node declaration
     NODE_OPTS = [
       'color', # default: black; node shape color
@@ -236,6 +240,10 @@ def quote_label(label)
         # Return a quoted version of the label otherwise.
         '"' + label.split(/(\\n|\\r|\\l)/).collect do |part|
           case part
+          when "\\n", "\\r", "\\l"
+            part
+          else
+            part.gsub('\\', '\\\\\\\\').gsub('"', '\\\\"').gsub("\n", '\\n')
           when "\\n", "\\r", "\\l"
             part
           else
@@ -345,6 +353,8 @@ def to_s(leader = '', indent = '    ')
           leader + (@name.nil? ? '' : quote_ID(@name) + " ") + "[\n" +
           stringified_options + "\n" +
           leader + "]"
+          stringified_options + "\n" +
+          leader + "]"
         end
       end
     end # class Node
@@ -424,6 +434,7 @@ def to_s(leader = '', indent = '    ')
 
         hdr + (options.empty? ? '' : options + "\n\n") +
         (elements.empty? ? '' : elements + "\n") + leader + "}"
+        (elements.empty? ? '' : elements + "\n") + leader + "}"
       end
     end # class Graph
 
@@ -508,6 +519,8 @@ def to_s(leader = '', indent = '    ')
           leader + quote_ID(f_s) + ' ' + edge_link + ' ' + quote_ID(t_s) + " [\n" +
           stringified_options + "\n" +
           leader + "]"
+          stringified_options + "\n" +
+          leader + "]"
         end
       end