Fix Bug 420766 - Envelope From is empty on outgoing mails

BUG: 420766
Revert support for big email (for the moment it creates too many
bug in encoding)

messageviewer/src/htmlwriter/webengineparthtmlwriter.cpp

@@ -55,7 +55,7 @@ void WebEnginePartHtmlWriter::begin()
     MessageViewer::WebEngineEmbedPart::self()->clear();
     mState = Begun;
 }
-
+//#define LOAD_BIG_EMAIL 1
 void WebEnginePartHtmlWriter::end()
 {
     BufferedHtmlWriter::end();
@@ -66,9 +66,7 @@ void WebEnginePartHtmlWriter::end()
         insertExtraHead();
         mExtraHead.clear();
     }
-    // see QWebEnginePage::setHtml()
-    //mHtmlView->setContent(data(), QStringLiteral("text/html;charset=UTF-8"), QUrl(QStringLiteral("file:///")));
-
+#ifdef LOAD_BIG_EMAIL
     mTempFile = new QTemporaryFile(QDir::tempPath() + QLatin1String("/messageviewer_XXXXXX")+ QLatin1String(".html"));
     mTempFile->open();
     QTextStream stream(mTempFile);
@@ -76,12 +74,15 @@ void WebEnginePartHtmlWriter::end()
     const QByteArray codecValue = Util::htmlCodec(data(), codec());
     stream.setCodec(codecValue.constData());
     stream << data();
-
     //Bug 387061
     mHtmlView->load(QUrl::fromLocalFile(mTempFile->fileName()));
     //qDebug() << " tempFile.fileName()" << mTempFile->fileName();
     mHtmlView->show();
     mTempFile->close();
+#else
+    mHtmlView->setContent(data(), QStringLiteral("text/html;charset=UTF-8"), QUrl(QStringLiteral("file:///")));
+    mHtmlView->show();
+#endif
     clear();
 
     mHtmlView->setUpdatesEnabled(true);