QFont::DemiBold can behave differently with GDI compared to DirectWrite

A font without any DemiBold (weight 600) style but with Normal (400) and Bold (700) styles shows the Bold one with DirectWrite, but the Normal one + DWRITE_FONT_SIMULATIONS_BOLD with GDI.

"Times New Roman" is such a font on Windows. The following example illustrates the differences when running with fontengine=gdi vs. no options (i.e. DirectWrite is used).

#include <QApplication>
#include <QLabel>

int main(int argc, char **argv) {
  QApplication app(argc, argv);
  QLabel lbl("BoldText");
  
  auto font = lbl.font();
  font.setFamily("Times New Roman");
  font.setWeight(QFont::DemiBold); // or QFont::Bold
  lbl.setFont(font);

  lbl.show();

  return QApplication::exec();
}

Fontengine	Bold	DemiBold
GDI
DirectWrite

As you can see, DemiBold is thicker on GDI compared to DirectWrite. "Times New Roman" actually uses DirectWrite in all cases, even when the fontengine is GDI, because the font-face created from CreateFontFaceFromHdc has simulations (DWRITE_FONT_SIMULATIONS_BOLD).

What's surprising is that the returned font-face claims to have a weight of 700.
Constructing a font of weight 700 (Bold) and enabling the bold-simulation results in text that's too thick (compared to GDI):

However, when using a font of weight 400 (Normal) and enabling the bold-simulation, the result is the same as with GDI (goal):