Bug 1353917 - Skip the downloading page in the update wizard if the update is already staged. r?rstrong The update wizard's fallback mode (where it appears on startup to download and apply a complete update if applying a partial update has failed) begins to download and stage the update without waiting for the user to confirm. This means it can get ahead of itself and actually finish downloading and staging before the user can click OK to bring up the progress page. The progress page does not expect this and errors out in a way that breaks the otherwise valid update. This change therefore skips over that page if the update is finished staging when it would normally be shown. MozReview-Commit-ID: E6P2UKO4C9h

--- a/toolkit/mozapps/update/content/updates.js
+++ b/toolkit/mozapps/update/content/updates.js
@@ -1199,16 +1199,18 @@ var gErrorPatchingPage = {
    * Initialize
    */
   onPageShow() {
     gUpdates.setButtons(null, null, "okButton", true);
   },
 
   onWizardNext() {
     switch (gUpdates.update.selectedPatch.state) {
+      case STATE_APPLIED:
+      case STATE_APPLIED_SERVICE:
       case STATE_PENDING:
       case STATE_PENDING_SERVICE:
         gUpdates.wiz.goTo("finished");
         break;
       case STATE_DOWNLOADING:
         gUpdates.wiz.goTo("downloading");
         break;
       case STATE_DOWNLOAD_FAILED: