Don't process text changes when ChromeVox range is elsewhere

chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview Handles automation from a desktop automation node.
  */
 
 goog.provide('DesktopAutomationHandler');
 
@@ skipping 397 matching lines @@
     if (!evt.target.state.focused ||
         (topRoot && topRoot.parent && !topRoot.parent.state.focused))
       return;
 
     if (!ChromeVoxState.instance.currentRange) {
       this.onEventDefault(evt);
       ChromeVoxState.instance.setCurrentRange(
           cursors.Range.fromNode(evt.target));
     }
 
-    this.createTextEditHandlerIfNeeded_(evt.target);
+    // Re-target the node to the root of the editable.
+    var target = evt.target;
+    while (target.parent && target.parent.state.editable)
+      target = target.parent;
+    var voxTarget = ChromeVoxState.instance.currentRange.start.node;
+    while (voxTarget && voxTarget.parent && voxTarget.parent.state.editable)
+      voxTarget = voxTarget.parent;
+
+    // It is possible that ChromeVox has range over some other node
+    // when a text field is focused.
+    if (!target.state.focused || target != voxTarget)
+      return;
+
+    this.createTextEditHandlerIfNeeded_(target);
 
     // Sync the ChromeVox range to the editable, if a selection exists.
     var anchorObject = evt.target.root.anchorObject;
     var anchorOffset = evt.target.root.anchorOffset || 0;
     var focusObject = evt.target.root.focusObject;
     var focusOffset = evt.target.root.focusOffset || 0;
     if (anchorObject && focusObject) {
       var selectedRange = new cursors.Range(
           new cursors.WrappingCursor(anchorObject, anchorOffset),
           new cursors.WrappingCursor(focusObject, focusOffset));
@@ skipping 137 matching lines @@
 DesktopAutomationHandler.init_ = function() {
   chrome.automation.getDesktop(function(desktop) {
     ChromeVoxState.desktopAutomationHandler =
         new DesktopAutomationHandler(desktop);
   });
 };
 
 DesktopAutomationHandler.init_();
 
 });  // goog.scope