diff --git a/libs/qsynedit/qsynedit/document.cpp b/libs/qsynedit/qsynedit/document.cpp
index bee41735..181f2cd1 100644
--- a/libs/qsynedit/qsynedit/document.cpp
+++ b/libs/qsynedit/qsynedit/document.cpp
@@ -92,22 +92,6 @@ int Document::lineWidth(int line)
         return 0;
 }
 
-void Document::updateLineWidth(int line)
-{
-    QMutexLocker locker(&mMutex);
-    if (line>=0 && line < mLines.size()) {
-        if (mLines[line]->mWidth<0) {
-            int width;
-            QList<int> glyphPositions = mGlyphCalculator.calcLineWidth(
-                        mLines[line]->lineText(),
-                        mLines[line]->glyphStartCharList(),
-                        width);
-            setLineWidth(line, width,glyphPositions);
-            mLines[line]->mIsTempWidth = true;
-        }
-    }
-}
-
 int Document::lineWidth(int line, const QString &newText)
 {
     QMutexLocker locker(&mMutex);
@@ -1268,12 +1252,6 @@ void Document::invalidateAllLineWidth()
         line->invalidateWidth();
     }
     mIndexOfLongestLine = -1;
-    FindMaxLineWidthThread *thread = new FindMaxLineWidthThread(mLines, mGlyphCalculator);
-    connect(thread, &FindMaxLineWidthThread::maxWidthLineFound,
-            this, &Document::maxWidthLineFound);
-    connect(thread, &QThread::finished,
-            thread, &QThread::deleteLater);
-    thread->start();
 }
 
 void Document::invalidateAllNonTempLineWidth()
@@ -1778,29 +1756,4 @@ void GlyphCalculator::setFont(const QFont &newFont)
     mSpaceWidth = mFontMetrics.horizontalAdvance(" ");
 }
 
-FindMaxLineWidthThread::FindMaxLineWidthThread(const DocumentLines &lines, const GlyphCalculator &glyphCalculator, QObject *parent):
-    QThread(parent),
-    mLines{lines},
-    mGlyphCalculator{glyphCalculator}
-{
-
-}
-
-void FindMaxLineWidthThread::run()
-{
-    int maxWidth = 0;
-    int maxWidthLine = -1;
-    for (int i=0;i<mLines.size();i++) {
-        int width = mLines[i]->mWidth;
-        if ( width < 0 )
-            width = mGlyphCalculator.stringWidth(mLines[i]->lineText(),0);
-        if (width > maxWidth) {
-            maxWidth = width;
-            maxWidthLine = i;
-        }
-    }
-    if (maxWidthLine >= 0)
-        emit maxWidthLineFound(maxWidthLine);
-}
-
 }
diff --git a/libs/qsynedit/qsynedit/document.h b/libs/qsynedit/qsynedit/document.h
index 60691e94..df2b0ba0 100644
--- a/libs/qsynedit/qsynedit/document.h
+++ b/libs/qsynedit/qsynedit/document.h
@@ -36,7 +36,6 @@ QList<int> calcGlyphStartCharList(const QString &text);
 void expandGlyphStartCharList(const QString& strAdded, int oldStrLen, QList<int> &glyphStartCharList);
 
 class Document;
-class FindMaxLineWidthThread;
 
 using SearchConfirmAroundProc = std::function<bool ()>;
 /**
@@ -180,7 +179,6 @@ private:
     bool mIsTempWidth;
     UpdateWidthFunc mUpdateWidthFunc;
     friend class Document;
-    friend class FindMaxLineWidthThread;
 };
 
 typedef std::shared_ptr<DocumentLine> PDocumentLine;
@@ -275,26 +273,6 @@ private:
     bool mForceMonospace;
 };
 
-class FindMaxLineWidthThread: public QThread {
-    Q_OBJECT
-public:
-    explicit FindMaxLineWidthThread(
-            const DocumentLines &lines,
-            const GlyphCalculator& glyphCalculator,
-            QObject* parent=nullptr);
-    FindMaxLineWidthThread(const FindMaxLineWidthThread&) = delete;
-signals:
-    void maxWidthLineFound(int line);
-private:
-    DocumentLines mLines;
-    GlyphCalculator mGlyphCalculator;
-
-    // QThread interface
-protected:
-    void run() override;
-};
-
-
 /**
  * @brief The Document class
  *
@@ -349,8 +327,6 @@ public:
      */
     int lineWidth(int line);
 
-    void updateLineWidth(int line);
-
     /**
      * @brief get width of the specified text / line
      *
@@ -646,7 +622,6 @@ signals:
     void inserted(int startLine, int count);
     void putted(int line);
     void maxLineWidthChanged();
-    void lineWidthUpdateNeeded(int line);
 protected:
     QString getTextStr() const;
     void setUpdateState(bool Updating);
@@ -654,9 +629,6 @@ protected:
     void addItem(const QString& s);
     void putTextStr(const QString& text);
     void internalClear();
-    void maxWidthLineFound(int line) {
-        emit lineWidthUpdateNeeded(line);
-    }
 private:
     void invalidateAllLineWidth();
     bool lineWidthValid(int line);
diff --git a/libs/qsynedit/qsynedit/qsynedit.cpp b/libs/qsynedit/qsynedit/qsynedit.cpp
index 48dba0b4..81faf289 100644
--- a/libs/qsynedit/qsynedit/qsynedit.cpp
+++ b/libs/qsynedit/qsynedit/qsynedit.cpp
@@ -44,20 +44,6 @@
 
 #define UPDATE_HORIZONTAL_SCROLLBAR_EVENT ((QEvent::Type)(QEvent::User+1))
 #define UPDATE_VERTICAL_SCROLLBAR_EVENT ((QEvent::Type)(QEvent::User+2))
-#define UPDATE_LINE_WIDTH_EVENT ((QEvent::Type)(QEvent::User+3))
-
-class UpdateLineWidthEvent: public QEvent{
-public:
-    explicit UpdateLineWidthEvent(int line):
-        QEvent{UPDATE_LINE_WIDTH_EVENT},
-        mLine{line}
-    {
-
-    }
-    int line() const { return mLine; }
-private:
-    int mLine;
-};
 
 namespace QSynedit {
 QSynEdit::QSynEdit(QWidget *parent) : QAbstractScrollArea(parent),
@@ -91,7 +77,6 @@ QSynEdit::QSynEdit(QWidget *parent) : QAbstractScrollArea(parent),
     connect(mDocument.get(), &Document::cleared, this, &QSynEdit::updateVScrollbar);
     connect(mDocument.get(), &Document::deleted, this, &QSynEdit::updateVScrollbar);
     connect(mDocument.get(), &Document::inserted, this, &QSynEdit::updateVScrollbar);
-    connect(mDocument.get(), &Document::lineWidthUpdateNeeded, this, &QSynEdit::onLineWidthUpdateNeeded);
 
     mGutterWidth = 0;
 
@@ -1770,12 +1755,6 @@ void QSynEdit::onMaxLineWidthChanged()
     updateHScrollBarLater();
 }
 
-void QSynEdit::onLineWidthUpdateNeeded(int line)
-{
-    UpdateLineWidthEvent * event = new UpdateLineWidthEvent(line);
-    qApp->postEvent(this,event);
-}
-
 void QSynEdit::updateHScrollBarLater()
 {
     QEvent * event = new QEvent(UPDATE_HORIZONTAL_SCROLLBAR_EVENT);
@@ -3164,12 +3143,6 @@ void QSynEdit::doUpdateVScrollbar()
     verticalScrollBar()->setSingleStep(mTextHeight);
 }
 
-void QSynEdit::doUpdateLineWidth(int line)
-{
-    mDocument->updateLineWidth(line);
-}
-
-
 void QSynEdit::updateCaret()
 {
     if (mDocument->maxLineWidth()<0)
@@ -6008,12 +5981,6 @@ bool QSynEdit::event(QEvent *event)
         event->setAccepted(true);
         doUpdateHScrollbar();
         break;
-    case UPDATE_LINE_WIDTH_EVENT: {
-        event->setAccepted(true);
-        UpdateLineWidthEvent* updateEvent = dynamic_cast<UpdateLineWidthEvent *>(event);
-        doUpdateLineWidth(updateEvent->line());
-    }
-        break;
     case QEvent::KeyPress:{
         QKeyEvent* keyEvent = dynamic_cast<QKeyEvent *>(event);
         if(keyEvent->key() == Qt::Key_Tab || keyEvent->key() == Qt::Key_Backtab)
diff --git a/libs/qsynedit/qsynedit/qsynedit.h b/libs/qsynedit/qsynedit/qsynedit.h
index 4c592446..34627d7b 100644
--- a/libs/qsynedit/qsynedit/qsynedit.h
+++ b/libs/qsynedit/qsynedit/qsynedit.h
@@ -525,7 +525,6 @@ private:
     void doUpdateHScrollbar();
     void updateVScrollbar();
     void doUpdateVScrollbar();
-    void doUpdateLineWidth(int line);
     void updateCaret();
     void recalcCharExtent();
     QString expandAtWideGlyphs(const QString& S);
@@ -646,7 +645,6 @@ private:
 
 private slots:
     void onMaxLineWidthChanged();
-    void onLineWidthUpdateNeeded(int line);
     void updateHScrollBarLater();
     void onBookMarkOptionsChanged();
     void onGutterChanged();