Bug 145243: warning should be presented if user attempts cancellation of publish. r=kaie, sr=hewitt, moa=brade

editor/ui/composer/locale/en-US/editor.properties

@@ -87,6 +87,11 @@ AbandonChanges=Abandon unsaved changes to "%title%" and reload page?
 DocumentTitle=Page Title
 NeedDocTitle=Please enter a title for the current page.
 DocTitleHelp=This identifies the page in the window title and bookmarks.
+CancelPublishTitle=Cancel publishing?
+## LOCALIZATION NOTE: "Continue" in this sentence must match the text for
+## the CancelPublishContinue key below
+CancelPublishMessage=Cancelling while publishing is in progress may result in your file(s) being incompletely transferred. Would you like to Continue or Cancel?
+CancelPublishContinue=Continue
 AttributesFor=Current attributes for: 
 MissingImageError=Please enter or choose an image of type gif, jpg, or png.
 EmptyHREFError=Please choose a location to create a new link.

editor/ui/dialogs/content/EditorPublishProgress.js

@@ -309,6 +309,25 @@ function CheckKeepOpen()
 
 function onClose()
 {
+  if (!gFinished)
+  {
+    const nsIPromptService = Components.interfaces.nsIPromptService;
+    var promptService = Components.classes["@mozilla.org/embedcomp/prompt-service;1"]
+                                  .getService(nsIPromptService);
+    const buttonFlags = (nsIPromptService.BUTTON_TITLE_IS_STRING *
+                         nsIPromptService.BUTTON_POS_0) +
+                        (nsIPromptService.BUTTON_TITLE_CANCEL *
+                         nsIPromptService.BUTTON_POS_1);
+    var button = promptService.confirmEx(window,
+                                         GetString("CancelPublishTitle"),
+                                         GetString("CancelPublishMessage"),
+                                         buttonFlags,
+                                         GetString("CancelPublishContinue"),
+                                         null, null, null, {});
+    if (button == 0)
+      return false;
+  }
+
   if (gTimerID)
   {
     clearTimeout(gTimerID);