Check for links again when the github-link is removed

this happens when 'undo' is triggerd, where the whole control bar gets replaced.
instead of binding the 'undo' link, checking for dom removal seems more bullet
proof. although the func within func is kinda nasty---- this fixes #25

Author: muan

src/inject/inject.js

@@ -3,6 +3,7 @@ chrome.extension.sendMessage({}, function(settings) {
   initOnHashChangeAction(settings['Domains'])
   initShortcuts(settings['Shortcut'], settings['BackgroundShortcut'])
   initListViewShortcut(settings['RegExp'])
+
 })
 
 function initOnHashChangeAction(domains) {
@@ -18,6 +19,10 @@ function initOnHashChangeAction(domains) {
 
   // Find GitHub link and append it to tool bar on hashchange
   window.onhashchange = function() {
+    fetchAndAppendGitHubLink()
+  }
+
+  function fetchAndAppendGitHubLink() {
     // In case previous intervals got interrupted
     clearAllIntervals()
 
@@ -42,6 +47,10 @@ function initOnHashChangeAction(domains) {
           $(".iH > div").append(link)
           window.idled = true
 
+          document.getElementsByClassName('github-link')[0].addEventListener("DOMNodeRemovedFromDocument", function (ev) {
+            fetchAndAppendGitHubLink()
+          }, false)
+
         }
 
         clearInterval(retryForActiveMailBody)