Fixing the crash from #367 (hopefully) now.

src/defines.pri

@@ -16,8 +16,7 @@ win32 {
 }
 
 DEFINES *= QT_NO_URL_CAST_FROM_STRING
-# Apparently, it may cause crashes on some machines
-#DEFINES *= QT_USE_QSTRINGBUILDER
+DEFINES *= QT_USE_QSTRINGBUILDER
 
 ##It won't compile on windows with this define. Some bug in qtsingleapp / qvector template
 !win32: !CONFIG(debug, debug|release): DEFINES *= QT_NO_DEBUG_OUTPUT

src/lib/webview/webpage.cpp

@@ -54,7 +54,7 @@
 
 QString WebPage::m_lastUploadLocation = QDir::homePath();
 QString WebPage::m_userAgent;
-QString WebPage::m_fakeUserAgent = "Mozilla/5.0 (" + qz_buildSystem() + ") AppleWebKit/" + QupZilla::WEBKITVERSION + " (KHTML, like Gecko) Chrome/10.0 Safari/" + QupZilla::WEBKITVERSION;
+QString WebPage::m_fakeUserAgent;
 QUrl WebPage::m_lastUnsupportedUrl;
 QList<WebPage*> WebPage::m_livingPages;
 
@@ -434,6 +434,10 @@ QString WebPage::userAgentForUrl(const QUrl &url) const
 {
     // Let Google services play nice with us
     if (url.host().contains("google")) {
+        if (m_fakeUserAgent.isEmpty()) {
+            m_fakeUserAgent = "Mozilla/5.0 (" + qz_buildSystem() + ") AppleWebKit/" + QupZilla::WEBKITVERSION + " (KHTML, like Gecko) Chrome/10.0 Safari/" + QupZilla::WEBKITVERSION;
+        }
+
         return m_fakeUserAgent;
     }