Bug 1581589 - Return null in GetAccessibleOrContainer for text leafs of unrendered maps. r=Jamie

Differential Revision: https://phabricator.services.mozilla.com/D47185

--HG--
extra : moz-landing-system : lando

accessible/generic/DocAccessible.cpp

@@ -1193,6 +1193,16 @@ Accessible* DocAccessible::GetAccessibleOrContainer(
       }
     }
 
+    // Check if node is in zero-sized map
+    if (aNoContainerIfPruned && currNode->IsHTMLElement(nsGkAtoms::map)) {
+      if (nsIFrame* frame = currNode->AsContent()->GetPrimaryFrame()) {
+        if (nsLayoutUtils::GetAllInFlowRectsUnion(frame, frame->GetParent())
+                .IsEmpty()) {
+          return nullptr;
+        }
+      }
+    }
+
     if (Accessible* accessible = GetAccessible(currNode)) {
       return accessible;
     }

accessible/tests/mochitest/treeupdate/test_whitespace.html

@@ -135,6 +135,18 @@
       };
     }
 
+  function dontCreateMapWhiteSpace() {
+    const tree = { SECTION: [ { role: ROLE_TEXT_LEAF, name: "x" }, { TABLE: [ { ROW: [] }] } ] };
+    testAccessibleTree("container3", tree);
+
+    getNode("b").align = "Right";
+    document.body.offsetTop; // Flush layout.
+    window.windowUtils.advanceTimeAndRefresh(100);
+
+    testAccessibleTree("container3", tree);
+    window.windowUtils.restoreNormalRefresh();
+  }
+
     // //////////////////////////////////////////////////////////////////////////
     // Test
 
@@ -144,6 +156,8 @@
     var gQueue = null;
 
     function doTest() {
+      dontCreateMapWhiteSpace();
+
       gQueue = new eventQueue();
 
       gQueue.push(new removeImg());
@@ -175,6 +189,12 @@
   <div id="container1"><img src="../moz.png">  <img id="img1" src="../moz.png">  <img src="../moz.png"></div>
   <div><a id="container2"></a> <a><img src="../moz.png"></a></div>
 
+  <div id="container3">
+    <div id="c3_inner" role="presentation">
+      x<map> </map><table id="b"><tr></tr></table>
+    </div>
+  </div>
+
   <div id="eventdump"></div>
 </body>
 </html>