From 7c2dd4fed5b90f11af7cf5c20011a5c3fb3a5193 Mon Sep 17 00:00:00 2001
From: janekptacijarabaci <janekptacijarabaci@seznam.cz>
Date: Wed, 9 May 2018 15:28:44 +0200
Subject: Add UTF-8 as a default fallback encoding for unknown encodings

Issue #315
---
 browser/components/preferences/fonts.xul                   | 3 ++-
 browser/locales/en-US/chrome/browser/preferences/fonts.dtd | 1 +
 dom/encoding/FallbackEncoding.cpp                          | 3 +--
 modules/libpref/init/all.js                                | 2 +-
 4 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/browser/components/preferences/fonts.xul b/browser/components/preferences/fonts.xul
index ed1d1ecc2..26b1c6547 100644
--- a/browser/components/preferences/fonts.xul
+++ b/browser/components/preferences/fonts.xul
@@ -255,7 +255,8 @@
                control="DefaultCharsetList"/>
         <menulist id="DefaultCharsetList" preference="intl.charset.fallback.override">
           <menupopup>
-            <menuitem label="&languages.customize.Fallback.auto;"        value=""/>
+            <menuitem label="&languages.customize.Fallback.auto;"        value="*"/>
+            <menuitem label="&languages.customize.Fallback.utf8;"        value="UTF-8"/>
             <menuitem label="&languages.customize.Fallback.arabic;"      value="windows-1256"/>
             <menuitem label="&languages.customize.Fallback.baltic;"      value="windows-1257"/>
             <menuitem label="&languages.customize.Fallback.ceiso;"       value="ISO-8859-2"/>
diff --git a/browser/locales/en-US/chrome/browser/preferences/fonts.dtd b/browser/locales/en-US/chrome/browser/preferences/fonts.dtd
index 98d697d35..d55bcde8b 100644
--- a/browser/locales/en-US/chrome/browser/preferences/fonts.dtd
+++ b/browser/locales/en-US/chrome/browser/preferences/fonts.dtd
@@ -70,6 +70,7 @@
 <!ENTITY languages.customize.Fallback2.desc       "This text encoding is used for legacy content that fails to declare its encoding.">
 
 <!ENTITY languages.customize.Fallback.auto        "Default for Current Locale">
+<!ENTITY languages.customize.Fallback.utf8        "UTF-8">
 <!-- LOCALIZATION NOTE (languages.customize.Fallback.arabic):
      Translate "Arabic" as an adjective for an encoding, not as the name of the language. -->
 <!ENTITY languages.customize.Fallback.arabic      "Arabic">
diff --git a/dom/encoding/FallbackEncoding.cpp b/dom/encoding/FallbackEncoding.cpp
index 93fe0f8cb..29411412e 100644
--- a/dom/encoding/FallbackEncoding.cpp
+++ b/dom/encoding/FallbackEncoding.cpp
@@ -55,8 +55,7 @@ FallbackEncoding::Get(nsACString& aFallback)
   // Don't let the user break things by setting the override to unreasonable
   // values via about:config
   if (!EncodingUtils::FindEncodingForLabel(override, mFallback) ||
-      !EncodingUtils::IsAsciiCompatible(mFallback) ||
-      mFallback.EqualsLiteral("UTF-8")) {
+      !EncodingUtils::IsAsciiCompatible(mFallback)) {
     mFallback.Truncate();
   }
 
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 88a9af2da..2bf07eb91 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -2046,7 +2046,7 @@ pref("intl.accept_languages",               "chrome://global/locale/intl.propert
 pref("intl.menuitems.alwaysappendaccesskeys","chrome://global/locale/intl.properties");
 pref("intl.menuitems.insertseparatorbeforeaccesskeys","chrome://global/locale/intl.properties");
 pref("intl.charset.detector",               "chrome://global/locale/intl.properties");
-pref("intl.charset.fallback.override",      "");
+pref("intl.charset.fallback.override",      "*"); // '*' to make sure the UI selects the proper entry for 'auto'
 pref("intl.charset.fallback.tld",           true);
 pref("intl.ellipsis",                       "chrome://global-platform/locale/intl.properties");
 pref("intl.locale.matchOS",                 false);
-- 
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