CppEditor: Fix local renaming

CppLocalRenaming was connected to the initial QPlainTextEdit::document()
and not the "updated" QTextDocument set by
BaseTextEditorWidgetPrivate::setupDocumentSignals().

Broken by

    commit c655d7e5
    CppEditor: Convert to new construction scheme

Change-Id: I2e785a9d62a3bd39d9e613776cfc8e35dd9ff5d4
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

src/plugins/cppeditor/cppeditor.cpp

@@ -187,6 +187,8 @@ void CppEditorWidget::finalizeInitialization()
                 d->m_lastSemanticInfo.localUses = localUses;
     });
 
+    connect(document(), SIGNAL(contentsChange(int,int,int)),
+            &d->m_localRenaming, SLOT(onContentsChangeOfEditorWidgetDocument(int,int,int)));
     connect(&d->m_localRenaming, &CppLocalRenaming::finished, [this] {
         cppEditorDocument()->semanticRehighlight();
     });

src/plugins/cppeditor/cpplocalrenaming.cpp

@@ -68,8 +68,6 @@ CppLocalRenaming::CppLocalRenaming(TextEditor::BaseTextEditorWidget *editorWidge
     , m_firstRenameChangeExpected(false)
 {
     forgetRenamingSelection();
-    connect(m_editorWidget->document(), SIGNAL(contentsChange(int,int,int)),
-            this, SLOT(onContentsChangeOfEditorWidgetDocument(int,int,int)));
 }
 
 void CppLocalRenaming::updateSelectionsForVariableUnderCursor(