High CPU Usage Related to Scroll Bar Position

When I move horizontal scroll bar of the code editor to the right, the cpu goes crazy, if I align it to the left back again, it turns back to normal. I believe I have been encountering this bug for several major Qt versions along the way in the past. I decided to report it. Please watch the video I attached below. (I don't think this is something to do with macOS version)

Plus I had some similar bug in my own C++ program back in the days when I was coding a QML code editor with QPlainTextEdit. I think problem might be related to the line number painting code within the Qt Creator's codes. I would consider checking out for and while loop usages within the texteditor plugin.

Possible buggy functions that I would suggest looking at first:

void paintLineNumbers(QPainter &painter, const ExtraAreaPaintEventData &data,
    const QRectF &blockBoundingRect) const;
void paintTextMarks(QPainter &painter, const ExtraAreaPaintEventData &data,
    const QRectF &blockBoundingRect) const;
void paintCodeFolding(QPainter &painter, const ExtraAreaPaintEventData &data,
    const QRectF &blockBoundingRect) const;
void paintRevisionMarker(QPainter &painter, const ExtraAreaPaintEventData &data,
    const QRectF &blockBoundingRect) const;