From 4b01cfe59117bd06d974410b0417cfb32f47bcb6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kan-Ru=20Chen=20=28=E9=99=B3=E4=BE=83=E5=A6=82=29?=
 <kanru@kanru.info>
Date: Tue, 16 Jul 2013 18:00:58 +0800
Subject: [PATCH] Bug 874754 - Suppress nsIEditor.removeEditorObserver
 exception. r=fabrice

Based on patch from Yuan Xulei <xyuan@mozilla.com>

--HG--
extra : rebase_source : 77b563eaa784d42cdfd20a3aba1f5b928a53aaa6
---
 b2g/chrome/content/forms.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/b2g/chrome/content/forms.js b/b2g/chrome/content/forms.js
index b48f24a214e6..56292d98669d 100644
--- a/b2g/chrome/content/forms.js
+++ b/b2g/chrome/content/forms.js
@@ -235,7 +235,13 @@ let FormAssistant = {
 
     this._documentEncoder = null;
     if (this._editor) {
-      this._editor.removeEditorObserver(this);
+      // When the nsIFrame of the input element is reconstructed by
+      // CSS restyling, the editor observers are removed. Catch
+      // [nsIEditor.removeEditorObserver] failure exception if that
+      // happens.
+      try {
+        this._editor.removeEditorObserver(this);
+      } catch (e) {}
       this._editor = null;
     }