QtCreator: Add ability to specify text codec for default locale

On Windows you get one locale for unicode applications, and one
for old non-unicode applications.

Qt Creator uses QTextCodec::codecForLocale(), which would result
in the "System" codec, which is mapped for the default language
in the system.

Task-number: QTCREATORBUG-24776
Change-Id: I64496cc440931d3bf6f09314bdfc7c29e01b9f4f
Reviewed-by: David Schulz <david.schulz@qt.io>

src/app/main.cpp

@@ -60,6 +60,7 @@
 #include <QProcess>
 #include <QStandardPaths>
 #include <QTemporaryDir>
+#include <QTextCodec>
 
 #include <string>
 #include <vector>
@@ -661,6 +662,10 @@ int main(int argc, char **argv)
         }
     }
 
+    QByteArray overrideCodecForLocale = settings->value("General/OverrideCodecForLocale").toByteArray();
+    if (!overrideCodecForLocale.isEmpty())
+        QTextCodec::setCodecForLocale(QTextCodec::codecForName(overrideCodecForLocale));
+
     app.setDesktopFileName("org.qt-project.qtcreator.desktop");
 
     // Make sure we honor the system's proxy settings