diff --git a/NEWS.md b/NEWS.md
index cb28139c..0fa9d868 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,7 @@
+Version 0.6.6
+ - fix: crash when create new file
+ - implement: two editor view
+
 Version 0.6.5
  - implement: export as rtf / export as html
  - fix: the contents copied/exported are not correctly syntax colored
diff --git a/RedPandaIDE/editor.cpp b/RedPandaIDE/editor.cpp
index b3999970..bf48091b 100644
--- a/RedPandaIDE/editor.cpp
+++ b/RedPandaIDE/editor.cpp
@@ -382,6 +382,28 @@ bool Editor::isNew() const noexcept {
 QTabWidget* Editor::pageControl() noexcept{
     return mParentPageControl;
 }
+static int findWidgetInPageControl(QTabWidget* pageControl, QWidget* child) {
+    for (int i=0;i<pageControl->count();i++) {
+        if (pageControl->widget(i)==child)
+            return i;
+    }
+    return -1;
+}
+void Editor::setPageControl(QTabWidget *newPageControl)
+{
+    if (mParentPageControl==newPageControl)
+        return;
+    if (mParentPageControl!=nullptr) {
+        int index = findWidgetInPageControl(mParentPageControl,this);
+        if (index>=0)
+            mParentPageControl->removeTab(index);
+    }
+    mParentPageControl= newPageControl;
+    if (newPageControl!=nullptr) {
+        mParentPageControl->addTab(this,"");
+        updateCaption();
+    }
+}
 
 void Editor::undoSymbolCompletion(int pos)
 {
diff --git a/RedPandaIDE/editor.h b/RedPandaIDE/editor.h
index 2b7af4ed..c433135e 100644
--- a/RedPandaIDE/editor.h
+++ b/RedPandaIDE/editor.h
@@ -124,6 +124,7 @@ public:
     void activate();
 
     QTabWidget* pageControl() noexcept;
+    void setPageControl(QTabWidget* newPageControl);
 
     void updateCaption(const QString& newCaption=QString());
     void applySettings();
diff --git a/RedPandaIDE/editorlist.cpp b/RedPandaIDE/editorlist.cpp
index e88818ea..ffc54ff9 100644
--- a/RedPandaIDE/editorlist.cpp
+++ b/RedPandaIDE/editorlist.cpp
@@ -24,8 +24,8 @@ EditorList::EditorList(QTabWidget* leftPageWidget,
 Editor* EditorList::newEditor(const QString& filename, const QByteArray& encoding,
                  bool inProject, bool newFile,
                  QTabWidget* page) {
-    QTabWidget * parentPageControl = NULL;
-    if (page == NULL)
+    QTabWidget * parentPageControl = nullptr;
+    if (page == nullptr)
         parentPageControl = getNewEditorPageControl();
     else
         parentPageControl = page;
@@ -38,13 +38,25 @@ Editor* EditorList::newEditor(const QString& filename, const QByteArray& encodin
 }
 
 QTabWidget*  EditorList::getNewEditorPageControl() const {
-    //todo: return widget depends on layout
-    return mLeftPageWidget;
+    return getFocusedPageControl();
 }
 
 QTabWidget* EditorList::getFocusedPageControl() const {
     //todo:
-    return mLeftPageWidget;
+    switch(mLayout) {
+    case LayoutShowType::lstLeft:
+        return mLeftPageWidget;
+    case LayoutShowType::lstRight:
+        return mRightPageWidget;
+    case LayoutShowType::lstBoth: {
+        Editor* editor = dynamic_cast<Editor*>(mRightPageWidget->currentWidget());
+        if (editor && editor->hasFocus())
+            return mRightPageWidget;
+        return mLeftPageWidget;
+    }
+    default:
+        return nullptr;
+    }
 }
 
 void EditorList::showLayout(LayoutShowType layout)
@@ -55,7 +67,6 @@ void EditorList::showLayout(LayoutShowType layout)
     // Apply widths if layout does not change
     switch(mLayout) {
     case LayoutShowType::lstLeft:
-    case LayoutShowType::lstNone:
         mLeftPageWidget->setVisible(true);
         mRightPageWidget->setVisible(false);
         break;
@@ -71,16 +82,18 @@ void EditorList::showLayout(LayoutShowType layout)
 
 Editor* EditorList::getEditor(int index, QTabWidget* tabsWidget) const {
     QTabWidget* selectedWidget;
-    if (tabsWidget == NULL) {
-        selectedWidget = getFocusedPageControl(); // todo: get focused widget
+    if (tabsWidget == nullptr) {
+        selectedWidget = getFocusedPageControl();
     } else {
         selectedWidget = tabsWidget;
     }
+    if (!selectedWidget)
+        return nullptr;
     if (index == -1) {
         index = selectedWidget->currentIndex();
     }
     if (index<0 || index >= selectedWidget->count()) {
-        return NULL;
+        return nullptr;
     }
     return (Editor*)selectedWidget->widget(index);
 }
@@ -133,6 +146,25 @@ bool EditorList::closeEditor(Editor* editor, bool transferFocus, bool force) {
     return true;
 }
 
+bool EditorList::swapEditor(Editor *editor)
+{
+    Q_ASSERT(editor!=nullptr);
+    beginUpdate();
+    auto action = finally([this](){
+        endUpdate();
+    });
+    //remember old index
+    QTabWidget* fromPageControl = editor->pageControl();
+    if (fromPageControl == mLeftPageWidget) {
+        editor->setPageControl(mRightPageWidget);
+    } else {
+        editor->setPageControl(mLeftPageWidget);
+    }
+    updateLayout();
+    editor->activate();
+    return true;
+}
+
 void EditorList::beginUpdate() {
     if (mUpdateCount==0) {
         mPanel->setUpdatesEnabled(false);
@@ -241,7 +273,6 @@ bool EditorList::closeAll(bool force) {
             return false;
         }
     }
-
     return true;
 }
 
@@ -305,10 +336,6 @@ bool EditorList::getContentFromOpenedEditor(const QString &filename, QStringList
 void EditorList::getVisibleEditors(Editor *&left, Editor *&right)
 {
     switch(mLayout) {
-    case LayoutShowType::lstNone:
-        left = nullptr;
-        right = nullptr;
-        break;
     case LayoutShowType::lstLeft:
         left = getEditor(-1,mLeftPageWidget);
         right = nullptr;
@@ -326,11 +353,9 @@ void EditorList::getVisibleEditors(Editor *&left, Editor *&right)
 
 void EditorList::updateLayout()
 {
-    if (mLeftPageWidget->count() ==0 && mRightPageWidget->count() == 0)
-        showLayout(LayoutShowType::lstNone);
-    else if (mLeftPageWidget->count() > 0 && mRightPageWidget->count() == 0)
+    if (mRightPageWidget->count() == 0)
         showLayout(LayoutShowType::lstLeft);
-    else if (mLeftPageWidget->count() ==0 && mRightPageWidget->count() > 0)
+    else if (mLeftPageWidget->count() ==0)
         showLayout(LayoutShowType::lstRight);
     else
         showLayout(LayoutShowType::lstBoth);
diff --git a/RedPandaIDE/editorlist.h b/RedPandaIDE/editorlist.h
index 410bc601..fcfab65e 100644
--- a/RedPandaIDE/editorlist.h
+++ b/RedPandaIDE/editorlist.h
@@ -11,7 +11,6 @@ class EditorList
 {
 public:
     enum class LayoutShowType{
-        lstNone,
         lstLeft,
         lstRight,
         lstBoth
@@ -24,12 +23,14 @@ public:
 
     Editor* newEditor(const QString& filename, const QByteArray& encoding,
                      bool inProject, bool newFile,
-                     QTabWidget* page=NULL);
+                     QTabWidget* page=nullptr);
 
-    Editor* getEditor(int index=-1, QTabWidget* tabsWidget=NULL) const;
+    Editor* getEditor(int index=-1, QTabWidget* tabsWidget=nullptr) const;
 
     bool closeEditor(Editor* editor, bool transferFocus=true, bool force=false);
 
+    bool swapEditor(Editor* editor);
+
     bool closeAll(bool force = false);
 
     void forceCloseEditor(Editor* editor);
diff --git a/RedPandaIDE/mainwindow.cpp b/RedPandaIDE/mainwindow.cpp
index 75757e59..c72e4b15 100644
--- a/RedPandaIDE/mainwindow.cpp
+++ b/RedPandaIDE/mainwindow.cpp
@@ -1654,14 +1654,14 @@ void MainWindow::buildContextMenus()
     connect(ui->EditorTabsLeft->tabBar(),
             &QWidget::customContextMenuRequested,
             this,
-            &MainWindow::onEditorTabContextMenu
+            &MainWindow::onEditorLeftTabContextMenu
             );
 
     ui->EditorTabsRight->tabBar()->setContextMenuPolicy(Qt::CustomContextMenu);
     connect(ui->EditorTabsRight->tabBar(),
             &QWidget::customContextMenuRequested,
             this,
-            &MainWindow::onEditorTabContextMenu
+            &MainWindow::onEditorRightTabContextMenu
             );
 
     //context menu signal for Compile Issue view
@@ -2278,21 +2278,38 @@ void MainWindow::onEditorContextMenu(const QPoint &pos)
 
 }
 
-void MainWindow::onEditorTabContextMenu(const QPoint &pos)
+void MainWindow::onEditorRightTabContextMenu(const QPoint &pos)
 {
-    int index = ui->EditorTabsLeft->tabBar()->tabAt(pos);
+    onEditorTabContextMenu(ui->EditorTabsRight,pos);
+}
+
+void MainWindow::onEditorLeftTabContextMenu(const QPoint &pos)
+{
+    onEditorTabContextMenu(ui->EditorTabsLeft,pos);
+}
+
+
+void MainWindow::onEditorTabContextMenu(QTabWidget* tabWidget, const QPoint &pos)
+{
+    int index = tabWidget->tabBar()->tabAt(pos);
     if (index<0)
         return;
-    ui->EditorTabsLeft->setCurrentIndex(index);
+    tabWidget->setCurrentIndex(index);
     QMenu menu(this);
-    QTabBar* tabBar = ui->EditorTabsLeft->tabBar();
+    QTabBar* tabBar = tabWidget->tabBar();
     menu.addAction(ui->actionClose);
     menu.addAction(ui->actionClose_All);
     menu.addSeparator();
     menu.addAction(ui->actionOpen_Containing_Folder);
     menu.addAction(ui->actionOpen_Terminal);
     menu.addSeparator();
+    menu.addAction(ui->actionMove_To_Other_View);
+    menu.addSeparator();
     menu.addAction(ui->actionFile_Properties);
+    ui->actionMove_To_Other_View->setEnabled(
+                tabWidget==ui->EditorTabsRight
+                || tabWidget->count()>1
+                );
 
     menu.exec(tabBar->mapToGlobal(pos));
 }
@@ -2529,6 +2546,12 @@ void MainWindow::on_EditorTabsLeft_tabCloseRequested(int index)
     mEditorList->closeEditor(editor);
 }
 
+void MainWindow::on_EditorTabsRight_tabCloseRequested(int index)
+{
+    Editor* editor = mEditorList->getEditor(index,ui->EditorTabsRight);
+    mEditorList->closeEditor(editor);
+}
+
 void MainWindow::on_actionOpen_triggered()
 {
     try {
@@ -3507,6 +3530,11 @@ void MainWindow::on_EditorTabsLeft_tabBarDoubleClicked(int index)
     maximizeEditor();
 }
 
+void MainWindow::on_EditorTabsRight_tabBarDoubleClicked(int index)
+{
+    maximizeEditor();
+}
+
 
 void MainWindow::on_actionClose_triggered()
 {
@@ -3979,7 +4007,7 @@ PSymbolUsageManager &MainWindow::symbolUsageManager()
 
 void MainWindow::on_EditorTabsLeft_currentChanged(int index)
 {
-    Editor * editor = mEditorList->getEditor();
+    Editor * editor = mEditorList->getEditor(-1,ui->EditorTabsLeft);
     if (editor) {
         editor->reparseTodo();
     }
@@ -3988,7 +4016,7 @@ void MainWindow::on_EditorTabsLeft_currentChanged(int index)
 
 void MainWindow::on_EditorTabsRight_currentChanged(int index)
 {
-    Editor * editor = mEditorList->getEditor();
+    Editor * editor = mEditorList->getEditor(-1,ui->EditorTabsRight);
     if (editor) {
         editor->reparseTodo();
     }
@@ -4215,3 +4243,12 @@ void MainWindow::on_actionExport_As_HTML_triggered()
     }
 }
 
+
+void MainWindow::on_actionMove_To_Other_View_triggered()
+{
+    Editor * editor = mEditorList->getEditor();
+    if (editor) {
+        mEditorList->swapEditor(editor);
+    }
+}
+
diff --git a/RedPandaIDE/mainwindow.h b/RedPandaIDE/mainwindow.h
index 4025f7aa..28338060 100644
--- a/RedPandaIDE/mainwindow.h
+++ b/RedPandaIDE/mainwindow.h
@@ -155,7 +155,9 @@ public slots:
     void onMemoryExamineReady(const QStringList& value);
     void onLocalsReady(const QStringList& value);
     void onEditorContextMenu(const QPoint& pos);
-    void onEditorTabContextMenu(const QPoint& pos);
+    void onEditorRightTabContextMenu(const QPoint& pos);
+    void onEditorLeftTabContextMenu(const QPoint& pos);
+    void onEditorTabContextMenu(QTabWidget* tabWidget, const QPoint& pos);
     void disableDebugActions();
     void enableDebugActions();
     void onTodoParseStarted();
@@ -203,6 +205,7 @@ private slots:
     void on_actionNew_triggered();
 
     void on_EditorTabsLeft_tabCloseRequested(int index);
+    void on_EditorTabsRight_tabCloseRequested(int index);
 
     void on_actionOpen_triggered();
 
@@ -315,6 +318,7 @@ private slots:
     void on_splitterMessages_splitterMoved(int pos, int index);
 
     void on_EditorTabsLeft_tabBarDoubleClicked(int index);
+    void on_EditorTabsRight_tabBarDoubleClicked(int index);
 
     void on_actionClose_triggered();
 
@@ -377,7 +381,6 @@ private slots:
     void on_classBrowser_doubleClicked(const QModelIndex &index);
 
     void on_EditorTabsLeft_currentChanged(int index);
-
     void on_EditorTabsRight_currentChanged(int index);
 
     void on_tableTODO_doubleClicked(const QModelIndex &index);
@@ -396,6 +399,8 @@ private slots:
 
     void on_actionExport_As_HTML_triggered();
 
+    void on_actionMove_To_Other_View_triggered();
+
 private:
     Ui::MainWindow *ui;
     EditorList *mEditorList;
diff --git a/RedPandaIDE/mainwindow.ui b/RedPandaIDE/mainwindow.ui
index 1e961071..e6161fe4 100644
--- a/RedPandaIDE/mainwindow.ui
+++ b/RedPandaIDE/mainwindow.ui
@@ -1832,6 +1832,14 @@
     <string>Export As HTML</string>
    </property>
   </action>
+  <action name="actionMove_To_Other_View">
+   <property name="text">
+    <string>Move To Other View</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+M</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>
diff --git a/RedPandaIDE/qsynedit/TextPainter.cpp b/RedPandaIDE/qsynedit/TextPainter.cpp
index 8caa3364..6182bdb9 100644
--- a/RedPandaIDE/qsynedit/TextPainter.cpp
+++ b/RedPandaIDE/qsynedit/TextPainter.cpp
@@ -670,6 +670,8 @@ void SynEditTextPainter::PaintFoldAttributes()
             LastNonBlank = vLine - 1;
             while (LastNonBlank + 1 < edit->mLines->count() && edit->mLines->getString(LastNonBlank).isEmpty())
                 LastNonBlank++;
+            if (LastNonBlank>=edit->lines()->count())
+                continue;
             LineIndent = edit->getLineIndent(edit->mLines->getString(LastNonBlank));
             int braceLevel = edit->mLines->ranges(LastNonBlank).braceLevel;
             int indentLevel = braceLevel ;
diff --git a/RedPandaIDE/systemconsts.h b/RedPandaIDE/systemconsts.h
index ddd85b14..84c58a3d 100644
--- a/RedPandaIDE/systemconsts.h
+++ b/RedPandaIDE/systemconsts.h
@@ -3,7 +3,7 @@
 
 #include <QStringList>
 
-#define DEVCPP_VERSION "0.6.5"
+#define DEVCPP_VERSION "0.6.6"
 
 #ifdef Q_OS_WIN
 #define APP_SETTSINGS_FILENAME "redpandacpp.ini"