Issue 2879 - Make "view source in separate window" command work again

lib/child/commands.js

Index: lib/child/commands.js
===================================================================
--- a/lib/child/commands.js
+++ b/lib/child/commands.js
@@ -11,22 +11,24 @@ let {getNodeInfo} = require("./nodeInfo"
 let {
   state, selectElement, setAnchorElement, stopSelection
 } = require("./selection");
 let {getParentElement} = require("./utils");
 
 messageManager.addMessageListener("ElemHideHelper:Command", onCommand);
 messageManager.addMessageListener("ElemHideHelper:SerializeSelected",
                                   serializeSelected);
+messageManager.addMessageListener("ElemHideHelper:GetHTML", getHTML);
 
 onShutdown.add(() =>
 {
   messageManager.removeMessageListener("ElemHideHelper:Command", onCommand);
   messageManager.removeMessageListener("ElemHideHelper:SerializeSelected",
                                        serializeSelected);
+  messageManager.removeMessageListener("ElemHideHelper:GetHTML", getHTML);
 });
 
 function onCommand(message)
 {
   let command = message.data;
   if (typeof exports[command] == "function")
     exports[command]();
 }
@@ -66,16 +68,25 @@ function serializeNode(node)
 function serializeSelected(message)
 {
   messageManager.sendAsyncMessage("ElemHideHelper:Response", {
     messageId: message.data.messageId,
     serialized: serializeNode(state.selectedElement)
   });
 }
 
+function getHTML(message)
+{
+  messageManager.sendAsyncMessage("ElemHideHelper:Response", {
+    messageId: message.data.messageId,
+    html: state.selectedElement.outerHTML,
+    baseURI: state.selectedElement.baseURI
+  });
+}
+
 function quit()
 {
   stopSelection();
 }
 exports.quit = quit;
 
 function select()
 {