Inconsistent rendering results

[PikachuHy]

When I use Qt, I meet

Sometimes the rendered result is the lower part of the picture.

I guess there is something that affects the calculation of the spacing.

[NanoMichael]

That seems the context state was changed incorrectly, I'll fix it soon.

[jun-zhang]

Modify setPointSizeF in Font_qt to setPixelSize, or add QApplication::setAttribute(Qt::AA_EnableHighDpiScaling) in qt_main.cpp;