don't escape xml

Author: nidi3

graphviz-java/src/main/java/guru/nidi/graphviz/engine/Format.java

@@ -23,35 +23,20 @@
 
 public enum Format {
     PNG("svg", "png", true, true) {
-        @Override
-        String preProcess(String src) {
-            return encodeXml(super.preProcess(src));
-        }
-
         @Override
         EngineResult postProcess(Graphviz graphviz, EngineResult result) {
             return result.mapString(s -> postProcessSvg(graphviz.processOptions, s, true));
         }
     },
 
     SVG("svg", "svg", false, true) {
-        @Override
-        String preProcess(String src) {
-            return encodeXml(super.preProcess(src));
-        }
-
         @Override
         EngineResult postProcess(Graphviz graphviz, EngineResult result) {
             return result.mapString(s -> postProcessSvg(graphviz.processOptions, s, true));
         }
     },
 
     SVG_STANDALONE("svg", "svg", false, true) {
-        @Override
-        String preProcess(String src) {
-            return encodeXml(super.preProcess(src));
-        }
-
         @Override
         EngineResult postProcess(Graphviz graphviz, EngineResult result) {
             return result.mapString(s -> postProcessSvg(graphviz.processOptions, s, false));
@@ -108,10 +93,6 @@ private static String replaceSubSpaces(String src) {
         return new String(chars);
     }
 
-    private static String encodeXml(String src) {
-        return src.replace("&", "&");
-    }
-
     private static String postProcessSvg(ProcessOptions options, String result, boolean prefix) {
         final String unprefixed = prefix ? withoutPrefix(result) : result;
         return pointsToPixels(unprefixed, options.dpi, options.width, options.height, options.scale);