Use QIcon instead of QPixmap for icons. Use QPushButton for the filter menu instead of a QLabel.
Depends on D23942
Fix the font preview size in HiDPI
Change icon name. To match patch D23942
Either use a ToolButton for the filter feature, or turn "Scan for duplicate fonts" into a PushButton, so they match one way or another.
I changed it to QToolButton, but it still look different:
Unify button look