Qt 5.15 Widget has a bug on Chinese font size

Since qt5.7, the widget has a bug on chines font size. Now qt5.15 still has the same problem.

Chinese font size is bigger than which in qt5.6.

In factor, the chinese font size is not correct now.

From the attached pictures, we can see the bottom of Chinese font is correct in qt5.6, but it's wrong in qt5.15. Chinese font is overlap with the follow line.

Please fix this bug，because the error font size is realy ugly。