Invalidate the text edit handler on selection events

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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
index 87aea0970518a29e0788ea851c7afbbffb9b50fd..0fcb47c0c5322fd9db42558c283581c60ffbf14a 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
@@ -428,6 +428,9 @@ DesktopAutomationHandler.prototype = {
    * @param {!AutomationEvent} evt
    */
   onSelection: function(evt) {
+    // Invalidate any previous editable text handler state.

[dmazzoni, 2016/10/21 20:13:05]

Could you comment that this is because we get selection
events on menus, but the menu doesn't have focus?

I'd like to eventually fix this so that from the
perspective of accessibility, menu items really do
get focus.

[David Tseng, 2016/10/24 16:35:31]

Done.

+    this.textEditHandler_ = null;
+
     chrome.automation.getFocus(function(focus) {
       // Desktop tabs get "selection" when there's a focused webview during tab
       // switching.