2 files changed, 12 insertions, 2 deletions
diff --git a/src/plugins/cppeditor/cppeditor.cpp b/src/plugins/cppeditor/cppeditor.cpp
index 69cbe49437..a7ba65664d 100644
--- a/src/plugins/cppeditor/cppeditor.cpp
+++ b/src/plugins/cppeditor/cppeditor.cpp
@@ -641,9 +641,9 @@ void CPPEditorWidget::createToolBar(CPPEditor *editor)
     connect(m_outlineCombo, SIGNAL(activated(int)), this, SLOT(jumpToOutlineElement(int)));
     connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(updateOutlineIndex()));
     connect(m_outlineCombo, SIGNAL(currentIndexChanged(int)), this, SLOT(updateOutlineToolTip()));
-    connect(document(), SIGNAL(contentsChange(int,int,int)),
-            this, SLOT(onContentsChanged(int,int,int)));
 
+    // set up slots to document changes
+    updateContentsChangedSignal();
     connect(editorDocument(), SIGNAL(changed()), this, SLOT(updateFileName()));
 
     // set up function declaration - definition link
@@ -1870,6 +1870,8 @@ Core::IEditor *CPPEditor::duplicate(QWidget *parent)
 {
     CPPEditorWidget *newEditor = new CPPEditorWidget(parent);
     newEditor->duplicateFrom(editorWidget());
+    // A new QTextDocument was set, so update our signal/slot connection to the new document
+    newEditor->updateContentsChangedSignal();
     CppEditorPlugin::instance()->initializeEditor(newEditor);
     return newEditor->editor();
 }
@@ -2218,6 +2220,12 @@ void CPPEditorWidget::applyDeclDefLinkChanges(bool jumpToMatch)
     updateFunctionDeclDefLink();
 }
 
+void CPPEditorWidget::updateContentsChangedSignal()
+{
+    connect(document(), SIGNAL(contentsChange(int,int,int)),
+            this, SLOT(onContentsChanged(int,int,int)));
+}
+
 void CPPEditorWidget::abortDeclDefLink()
 {
     if (!m_declDefLink)
diff --git a/src/plugins/cppeditor/cppeditor.h b/src/plugins/cppeditor/cppeditor.h
index 68f2c4ae0c..341d4fc872 100644
--- a/src/plugins/cppeditor/cppeditor.h
+++ b/src/plugins/cppeditor/cppeditor.h
@@ -128,6 +128,8 @@ public:
     QSharedPointer<FunctionDeclDefLink> declDefLink() const;
     void applyDeclDefLinkChanges(bool jumpToMatch);
 
+    void updateContentsChangedSignal();
+
 Q_SIGNALS:
     void outlineModelIndexChanged(const QModelIndex &index);