bug 659620 - Hang when trying to edit a page on WikiMo with NVDA running r=surkov

From e0a6515b9f894ab39bcd6db51d43e24a677667b3 Mon Sep 17 00:00:00 2001
---
 accessible/src/base/nsBaseWidgetAccessible.cpp     |    3 +-
 .../tests/mochitest/actions/test_general.html      |   21 ++++++++++++++++++++
 2 files changed, 22 insertions(+), 2 deletions(-)

accessible/src/base/nsBaseWidgetAccessible.cpp

@@ -141,7 +141,7 @@ nsLinkableAccessible::GetNumActions(PRUint8 *aNumActions)
 {
   NS_ENSURE_ARG_POINTER(aNumActions);
 
-  *aNumActions = mActionAcc ? 1 : 0;
+  *aNumActions = (mIsOnclick || mIsLink) ? 1 : 0;
   return NS_OK;
 }
 
@@ -228,7 +228,6 @@ nsLinkableAccessible::BindToParent(nsAccessible* aParent,
   mIsOnclick = PR_FALSE;
 
   if (nsCoreUtils::HasClickListener(mContent)) {
-    mActionAcc = this;
     mIsOnclick = PR_TRUE;
     return;
   }

accessible/tests/mochitest/actions/test_general.html

@@ -36,9 +36,19 @@
           ID: "li_clickable3",
           actionName: "click",
           events: CLICK_EVENTS
+        },
+        {
+          ID: "onclick_img",
+          actionName: "click",
+          events: CLICK_EVENTS
         }
       ];
+
       testActions(actionsArray);
+
+      getAccessible("onclick_img").takeFocus();
+is(getAccessible("link1").numActions, 1, "links should have one action");
+is(getAccessible("link2").numActions, 1, "link with onclick handler should have 1 action");
     }
 
     SimpleTest.waitForExplicitFinish();
@@ -58,6 +68,11 @@
      title="Expose click action if mouseup and mousedown are registered">
     Mozilla Bug 423409
   </a>
+  <a target="_blank"
+     href="https://bugzilla.mozilla.org/show_bug.cgi?id=659620"
+     title="hang when trying to edit a page on wikimo with NVDA running">
+    Mozilla Bug 659620
+  </a>
   <p id="display"></p>
   <div id="content" style="display: none"></div>
   <pre id="test">
@@ -68,5 +83,11 @@
     <li id="li_clickable2" onmousedown="">Clickable list item</li>
     <li id="li_clickable3" onmouseup="">Clickable list item</li>
   </ul>
+
+  <!-- linkable accessibles -->
+  <img id="onclick_img" onclick="" src="../moz.png">
+
+  <a id="link1" href="www">linkable textleaf accessible</a>
+  <div id="link2" onclick="">linkable textleaf accessible</div>
 </body>
 </html>