Class PerformanceSplitterHandle

src/performancewidget.cpp:46–69

namespace
{
    class PerformanceSplitterHandle : public QSplitterHandle
    {
        public:
            explicit PerformanceSplitterHandle(Qt::Orientation orientation, QSplitter *parent)
                : QSplitterHandle(orientation, parent)
            {}

        protected:
            void paintEvent(QPaintEvent *) override
            {
                // This brings back the line effect that we lost when we moved to a splitter
                QPainter painter(this);
                const QColor lineColor = ColorScheme::DetectDarkMode()
                    ? QColor(0x55, 0x55, 0x55)
                    : QColor(0xb8, 0xb8, 0xb8);
                painter.setPen(lineColor);

                // The splitter handle is wider than the visible separator so it remains
                // easy to grab. Draw only a single centered pixel column; painting at x=0
                // can disappear after Qt clips/repositions the handle during resizing.
                const int x = this->width() / 2;
                painter.drawLine(x, 0, x, this->height());
            }
    };

    class PerformanceSplitter : public QSplitter
    {