diff --git a/3rdparty/terminalwidget/lib/ProcessInfo.cpp b/3rdparty/terminalwidget/lib/ProcessInfo.cpp
index d6ff1330..184de323 100644
--- a/3rdparty/terminalwidget/lib/ProcessInfo.cpp
+++ b/3rdparty/terminalwidget/lib/ProcessInfo.cpp
@@ -353,12 +353,7 @@ bool LinuxProcessInfo::readProcInfo(int pid)
             }
         } while (!statusLine.isNull() && uidLine.isNull());
 
-        uidStrings << uidLine.split(QLatin1Char('\t'), 
-        #if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-            QString::SkipEmptyParts);
-        #else
-            Qt::SkipEmptyParts);
-        #endif
+        uidStrings << uidLine.split(QLatin1Char('\t')); 
         // Must be 5 entries: 'Uid: %d %d %d %d' and
         // uid string must be less than 5 chars (uint)
         if (uidStrings.size() == 5) {
diff --git a/3rdparty/terminalwidget/lib/Pty.cpp b/3rdparty/terminalwidget/lib/Pty.cpp
index 154c9a4b..baa70659 100644
--- a/3rdparty/terminalwidget/lib/Pty.cpp
+++ b/3rdparty/terminalwidget/lib/Pty.cpp
@@ -265,6 +265,28 @@ Pty::Pty(QObject *parent)
 
 void Pty::init()
 {
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    // Must call parent class child process modifier, as it sets file descriptors ...etc
+    auto parentChildProcModifier = KPtyProcess::childProcessModifier();
+    setChildProcessModifier([parentChildProcModifier = std::move(parentChildProcModifier)]() {
+        if (parentChildProcModifier) {
+            parentChildProcModifier();
+        }
+
+        // reset all signal handlers
+        // this ensures that terminal applications respond to
+        // signals generated via key sequences such as Ctrl+C
+        // (which sends SIGINT)
+        struct sigaction action;
+        sigemptyset(&action.sa_mask);
+        action.sa_handler = SIG_DFL;
+        action.sa_flags = 0;
+        for (int signal = 1; signal < NSIG; signal++) {
+            sigaction(signal, &action, nullptr);
+        }
+    });
+#endif
+
     _windowColumns = 0;
     _windowLines = 0;
     _eraseChar = 0;
diff --git a/3rdparty/terminalwidget/lib/Screen.cpp b/3rdparty/terminalwidget/lib/Screen.cpp
index 51bb731c..ecf24b60 100644
--- a/3rdparty/terminalwidget/lib/Screen.cpp
+++ b/3rdparty/terminalwidget/lib/Screen.cpp
@@ -1452,8 +1452,10 @@ int Screen::copyLineToStream(int line ,
             std::copy(data + start, data + end, characterBuffer);
         }
 
-        // count cannot be any greater than length
-        count = qBound(0, count, length - start);
+        if (length > start) {
+            // count cannot be any greater than length
+            count = qBound(0, count, length - start);
+        }
 
         Q_ASSERT(screenLine < _lineProperties.count());
         currentLineProperties |= _lineProperties[screenLine];
diff --git a/3rdparty/terminalwidget/lib/TerminalDisplay.cpp b/3rdparty/terminalwidget/lib/TerminalDisplay.cpp
index a642a7c2..ecb19dd0 100644
--- a/3rdparty/terminalwidget/lib/TerminalDisplay.cpp
+++ b/3rdparty/terminalwidget/lib/TerminalDisplay.cpp
@@ -1269,13 +1269,13 @@ void TerminalDisplay::showResizeNotification()
      }
      if (!_resizeWidget)
      {
-         const QString label = tr("Size: XXX x XXX");
-        #if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
+        const QString label = tr("Size: XXX x XXX");
+        _resizeWidget = new QLabel(label, this);
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
         int width = _resizeWidget->fontMetrics().width(label);
-        #else
+#else
         int width = _resizeWidget->fontMetrics().horizontalAdvance(label);
-        #endif
-        _resizeWidget = new QLabel(label, this);
+#endif
         _resizeWidget->setMinimumWidth(width);
         _resizeWidget->setMinimumHeight(_resizeWidget->sizeHint().height());
         _resizeWidget->setAlignment(Qt::AlignCenter);
diff --git a/3rdparty/terminalwidget/lib/kptyprocess.cpp b/3rdparty/terminalwidget/lib/kptyprocess.cpp
index d3a08547..864c6fd4 100644
--- a/3rdparty/terminalwidget/lib/kptyprocess.cpp
+++ b/3rdparty/terminalwidget/lib/kptyprocess.cpp
@@ -38,23 +38,52 @@
 #include <QDebug>
 
 KPtyProcess::KPtyProcess(QObject *parent) :
-    KProcess(new KPtyProcessPrivate, parent)
+    KPtyProcess(-1, parent)
 {
     Q_D(KPtyProcess);
 
-    d->pty = new KPtyDevice(this);
+    // d->pty = new KPtyDevice(this);
+    d->pty = std::make_unique<KPtyDevice>(this);
     d->pty->open();
     connect(this, SIGNAL(stateChanged(QProcess::ProcessState)),
             SLOT(_k_onStateChanged(QProcess::ProcessState)));
 }
 
 KPtyProcess::KPtyProcess(int ptyMasterFd, QObject *parent) :
-    KProcess(new KPtyProcessPrivate, parent)
+    KProcess(parent),
+    d_ptr(new KPtyProcessPrivate)
 {
     Q_D(KPtyProcess);
 
-    d->pty = new KPtyDevice(this);
-    d->pty->open(ptyMasterFd);
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    setChildProcessModifier([d]() {
+        d->pty->setCTty();
+#if 0
+        if (d->addUtmp) {
+            d->pty->login(KUser(KUser::UseRealUserID).loginName().toLocal8Bit().constData(), qgetenv("DISPLAY").constData());
+        }
+#endif
+        if (d->ptyChannels & StdinChannel) {
+            dup2(d->pty->slaveFd(), 0);
+        }
+        if (d->ptyChannels & StdoutChannel) {
+            dup2(d->pty->slaveFd(), 1);
+        }
+        if (d->ptyChannels & StderrChannel) {
+            dup2(d->pty->slaveFd(), 2);
+        }
+    });
+#endif
+
+    //d->pty = new KPtyDevice(this);
+    d->pty = std::make_unique<KPtyDevice>(this);
+
+    if (ptyMasterFd == -1) {
+        d->pty->open();
+    } else {
+        d->pty->open(ptyMasterFd);
+    }
+
     connect(this, SIGNAL(stateChanged(QProcess::ProcessState)),
             SLOT(_k_onStateChanged(QProcess::ProcessState)));
 }
@@ -66,13 +95,14 @@ KPtyProcess::~KPtyProcess()
     if (state() != QProcess::NotRunning)
     {
         if (d->addUtmp)
-        {
-            d->pty->logout();
+    {
+        d->pty->logout();
             disconnect(SIGNAL(stateChanged(QProcess::ProcessState)),
                     this, SLOT(_k_onStateChanged(QProcess::ProcessState)));
         }
     }
-    delete d->pty;
+    // delete d->pty;
+    d->pty.release();
     waitForFinished(300); // give it some time to finish
     if (state() != QProcess::NotRunning)
     {
@@ -116,7 +146,7 @@ KPtyDevice *KPtyProcess::pty() const
 {
     Q_D(const KPtyProcess);
 
-    return d->pty;
+    return d->pty.get();
 }
 
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
diff --git a/3rdparty/terminalwidget/lib/kptyprocess.h b/3rdparty/terminalwidget/lib/kptyprocess.h
index 9fa1934f..9ceadcc5 100644
--- a/3rdparty/terminalwidget/lib/kptyprocess.h
+++ b/3rdparty/terminalwidget/lib/kptyprocess.h
@@ -34,6 +34,7 @@
 #include "kptydevice.h"
 
 #include <csignal>
+#include <memory>
 
 class KPtyDevice;
 
@@ -145,11 +146,12 @@ class KPtyProcess : public KProcess
      * @reimp
      */
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    void setupChildProcess() override;
+   void setupChildProcess() override;
 #endif
 
 private:
     Q_PRIVATE_SLOT(d_func(), void _k_onStateChanged(QProcess::ProcessState))
+    std::unique_ptr<KPtyProcessPrivate> const d_ptr;
 };
 
 
@@ -157,11 +159,9 @@ class KPtyProcess : public KProcess
 // private data //
 //////////////////
 
-class KPtyProcessPrivate : public KProcessPrivate {
+class KPtyProcessPrivate {
 public:
-    KPtyProcessPrivate() :
-        ptyChannels(KPtyProcess::NoChannels),
-        addUtmp(false)
+    KPtyProcessPrivate()
     {
     }
 
@@ -171,9 +171,9 @@ class KPtyProcessPrivate : public KProcessPrivate {
             pty->logout();
     }
 
-    KPtyDevice *pty;
-    KPtyProcess::PtyChannels ptyChannels;
-    bool addUtmp : 1;
+    std::unique_ptr<KPtyDevice> pty;
+    KPtyProcess::PtyChannels ptyChannels = KPtyProcess::NoChannels;
+    bool addUtmp = false;
 };
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(KPtyProcess::PtyChannels)
diff --git a/3rdparty/terminalwidget/lib/qtermwidget.cpp b/3rdparty/terminalwidget/lib/qtermwidget.cpp
index 1146d4c3..94386b6e 100644
--- a/3rdparty/terminalwidget/lib/qtermwidget.cpp
+++ b/3rdparty/terminalwidget/lib/qtermwidget.cpp
@@ -395,11 +395,7 @@ void QTermWidget::startTerminalTeletype()
 void QTermWidget::init(int startnow)
 {
     m_layout = new QVBoxLayout();
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-    m_layout->setMargin(0);
-#else
     m_layout->setContentsMargins(0, 0, 0, 0);
-#endif
     setLayout(m_layout);
 
     // translations
diff --git a/src/views/tabbar.cpp b/src/views/tabbar.cpp
index 66ae123c..e09a2677 100644
--- a/src/views/tabbar.cpp
+++ b/src/views/tabbar.cpp
@@ -11,21 +11,6 @@
 #include "terminalapplication.h"
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 #include "private/qtabbar_p.h"
-#else
-// Qt6 compatibility layer
-class QTabBarPrivateCompat
-{
-public:
-    static void initBasicStyleOption(QStyleOptionTab *option, int tabIndex, const QTabBar *tabBar)
-    {
-        option->initFrom(tabBar);
-        option->state &= ~QStyle::State_HasFocus;
-        option->rect = tabBar->tabRect(tabIndex);
-        option->text = tabBar->tabText(tabIndex);
-        option->icon = tabBar->tabIcon(tabIndex);
-        option->iconSize = tabBar->iconSize();
-    }
-};
 #endif
 
 #include <DApplication>
@@ -40,10 +25,8 @@ class QTabBarPrivateCompat
 #include <QStyleOptionTab>
 #include <QStylePainter>
 #include <QMouseEvent>
-// #include <QDesktopWidget>
 #include <QPainterPath>
 #include <QMimeData>
-#include <QTabBar>
 
 #ifdef DTKWIDGET_CLASS_DSizeMode
 #include <DSizeMode>
@@ -142,6 +125,7 @@ void TermTabStyle::drawPrimitive(QStyle::PrimitiveElement element, const QStyleO
 }
 //TermTabStyle 结束
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 /*******************************************************************************
  1. @函数:    initStyleOption
  2. @作者:    ut000610 daizhengwen
@@ -150,15 +134,11 @@ void TermTabStyle::drawPrimitive(QStyle::PrimitiveElement element, const QStyleO
 *******************************************************************************/
 void QTabBar::initStyleOption(QStyleOptionTab *option, int tabIndex) const
 {
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     Q_D(const QTabBar);
     d->initBasicStyleOption(option, tabIndex);
-#else
-    QTabBarPrivateCompat::initBasicStyleOption(option, tabIndex, this);
-#endif
 
     QRect textRect = style()->subElementRect(QStyle::SE_TabBarTabText, option, this);
-    option->text = fontMetrics().elidedText(option->text, elideMode(), textRect.width(),
+    option->text = fontMetrics().elidedText(option->text, d->elideMode, textRect.width(),
                                             Qt::TextShowMnemonic);
 
     /*********** Modify by ut000438 王亮 2020-11-25:fix bug 55813: 拖拽终端标签页终端闪退 ***********/
@@ -169,6 +149,7 @@ void QTabBar::initStyleOption(QStyleOptionTab *option, int tabIndex) const
         option->row = tabIndex;
     }
 }
+#endif
 
 TabBar::TabBar(QWidget *parent) : DTabBar(parent), m_rightClickTab(-1)
 {
@@ -314,6 +295,7 @@ int TabBar::getIndexByIdentifier(QString id)
     return  -1;
 }
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 /*!
     Removes the tab at position \a index.
 
@@ -327,7 +309,6 @@ int TabBar::getIndexByIdentifier(QString id)
 *******************************************************************************/
 void QTabBar::removeTab(int index)
 {
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     Q_D(QTabBar);
     if (d->validIndex(index)) {
         if (d->dragInProgress)
@@ -407,41 +388,11 @@ void QTabBar::removeTab(int index)
         }
         tabRemoved(index);
     }
-#else
-    if (index < 0 || index >= count())
-        return;
-
-    // Remove tab data
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    removeTabData(index);
-#else
-    // Qt6下不需要调用removeTabData
-#endif
-
-    // Remove tab
-    QTabBar::removeTab(index);
-
-    // Update current index if needed
-    if (index == currentIndex()) {
-        int newIndex = -1;
-        if (count() > 0) {
-            newIndex = qBound(0, index, count() - 1);
-            setCurrentIndex(newIndex);
-        } else {
-            emit currentChanged(-1);
-        }
-    } else if (index < currentIndex()) {
-        setCurrentIndex(currentIndex() - 1);
-    }
-
-    update();
-#endif
 
     TabBar *tabBar = qobject_cast<TabBar *>(this->parent());
 
     if (tabBar && tabBar->isEnableCloseTabAnimation()) {
         //tab关闭动画
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
         if (d->rightB->isVisible()) {
             for (int i = 0; i < index; i++) {
                 QTabBarPrivate::Tab *tab = &d->tabList[i];
@@ -455,9 +406,9 @@ void QTabBar::removeTab(int index)
                 tab->animation->start();
             }
         }
-#endif
     }
 }
+#endif
 
 void TabBar::removeTab(const QString &tabIdentifier)
 {