CppEditor: Move indenter construction to document constructor

A more direct approach than going through the widget's baseTextDocument,
relying on widget life time.

Change-Id: I62c10e53b1a9a1e6717c6eb3e3cc78dcbfd2868e
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/cppeditor/cppeditordocument.cpp

@@ -33,6 +33,7 @@
 #include "cpphighlighter.h"
 
 #include <cpptools/cppcodeformatter.h>
+#include <cpptools/cppqtstyleindenter.h>
 #include <cpptools/cpptoolsconstants.h>
 
 #include <QTextDocument>
@@ -48,6 +49,7 @@ CPPEditorDocument::CPPEditorDocument()
     connect(this, SIGNAL(mimeTypeChanged()),
             this, SLOT(onMimeTypeChanged()));
     setSyntaxHighlighter(new CppHighlighter);
+    setIndenter(new CppTools::CppQtStyleIndenter);
     onMimeTypeChanged();
 }