给QGraphicsTextItem设置文本居中出现内存泄漏 Google translate: Memory leak occurs when setting text center for QGraphicsTextItem

我的项目通过查找QGraphicsTextItem设置文字居中方式，查找到了链接https://blog.csdn.net/qq_44365088/article/details/106907000。

这段代码添加到项目的两年后，在前几天的一次测试时，我发现项目程序出现了内存泄漏，经过排查我发现是反复调用了这段代码的原因。

然后我写了一个模拟程序，我只调用了简单的set函数，内存却在不断增加。

Google translate:
In my project, I set the text centering method by looking for QGraphicsTextItem, and found the link https://blog.csdn.net/qq_44365088/article/details/106907000.

Two years after this code was added to the project, during a test a few days ago, I discovered that there was a memory leak in the project program. After investigation, I found that the reason was that this code was repeatedly called.

Then I wrote a simulation program. I only called a simple set function, but the memory kept increasing.

#include <QApplication>
#include <QTextBlockFormat>
#include <QTextCursor>
#include <QGraphicsPixmapItem>
int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    QGraphicsTextItem* item = new QGraphicsTextItem;
    item->setPlainText("qfhqiwhfoqwhfqiwhfoqf");
    while(1) {
         QTextBlockFormat format;
         format.setAlignment(Qt::AlignRight);
         QTextCursor cursor = item->textCursor();         
         cursor.setBlockFormat(format);
         item->setTextCursor(cursor); 
    }
    return a.exec();
}