Editable QComboBox using Fusion style overlaps with the combobox popup button

When using editable QComboBox with Fusion style, the textedit area overlaps with the button slightly.

The "qtbug68194_analyzed.png" screenshot shows the overlapped area with red line.

This issue is not reproducible if high dpi scaling is enabled through QApplication::setAttribute(Qt::AA_EnableHighDpiScaling). The images are taken from Windows 7 machine, but on Windows 10 machine the effect is slightly more visible than these screenshots. Also, high dpi monitors seem to emphasize the problem more.

Steps to reproduce:

• Run attached sample
• EXPECTED: Text area does not overlap with the button
• ACTUAL: Text area overlaps with the button