Bug 1440106 - Filter out hidden window. r=Jamie

--HG--
extra : rebase_source : 09bafc19dd602319c3b5f3d4bec0cab886dfc059

accessible/base/DocManager.cpp

@@ -22,6 +22,7 @@
 
 #include "mozilla/EventListenerManager.h"
 #include "mozilla/dom/Event.h" // for nsIDOMEvent::InternalDOMEvent()
+#include "nsContentUtils.h"
 #include "nsCURILoader.h"
 #include "nsDocShellLoadTypes.h"
 #include "nsIChannel.h"
@@ -478,6 +479,16 @@ DocManager::CreateDocOrRootAccessible(nsIDocument* aDocument)
     return nullptr;
   }
 
+  nsIDocShell* docShell = aDocument->GetDocShell();
+  if (!docShell || docShell->IsInvisible()) {
+    return nullptr;
+  }
+
+  nsIWidget* widget = nsContentUtils::WidgetForDocument(aDocument);
+  if (!widget || widget->WindowType() == eWindowType_invisible) {
+    return nullptr;
+  }
+
   // Ignore documents without presshell and not having root frame.
   nsIPresShell* presShell = aDocument->GetShell();
   if (!presShell || presShell->IsDestroying())

accessible/tests/mochitest/events/docload/test_docload_root.html

@@ -64,12 +64,6 @@
         const accTree = {
           role: ROLE_APP_ROOT,
           children: [
-            {
-              role: ROLE_CHROME_WINDOW
-            },
-            {
-              role: ROLE_CHROME_WINDOW
-            },
             {
               role: ROLE_CHROME_WINDOW
             },

accessible/tests/mochitest/events/docload/test_docload_shutdown.html

@@ -80,12 +80,6 @@
         const accTree = {
           role: ROLE_APP_ROOT,
           children: [
-            {
-              role: ROLE_CHROME_WINDOW
-            },
-            {
-              role: ROLE_CHROME_WINDOW
-            },
             {
               role: ROLE_CHROME_WINDOW
             },